Tanzanite is a rare blue-to-violet variety of the mineral zoisite that is commercially mined in a small region of northern Tanzania. Its distinctive color, strong pleochroism, limited geographic source, and status as a December birthstone have made it one of the most recognizable modern colored gemstones.
But buying Tanzanite requires more than choosing the biggest or bluest stone you can find. Color saturation, clarity, cut, carat weight, treatment disclosure, durability, setting style, and seller transparency can all affect the beauty, value, and long-term suitability of the gemstone.
This Tanzanite buying guide explains exactly what to look for, what to avoid, how Tanzanite quality is evaluated, what common grading terms really mean, and how to choose Tanzanite jewelry with greater confidence.
Quick Buying Answer:
When buying Tanzanite, prioritize attractive violetish-blue or bluish-violet color, strong saturation, good transparency, minimal eye-visible inclusions, a lively symmetrical cut, clearly disclosed treatments, and an appropriate protective setting if the stone will be worn in a ring. Tanzanite ranks about 6–7 on the Mohs scale, so it requires more careful wear than diamonds, sapphires, or rubies.
Tanzanite Buying Checklist
Before purchasing Tanzanite or Tanzanite jewelry, check the following:
- Color: Look for attractive blue-to-violet color with good saturation rather than dull grayish or brownish appearance.
- Clarity: Fine faceted Tanzanite is generally eye-clean or close to eye-clean.
- Cut: Choose a symmetrical, lively stone without a large transparent window through the center.
- Carat weight: Consider size together with color, cut, and clarity rather than assuming bigger automatically means better.
- Treatment disclosure: Ask whether the Tanzanite has been heat-treated or received any other treatment.
- Dimensions: Compare millimeter measurements as well as carat weight.
- Durability: Choose a protective setting if the stone will be worn frequently in a ring.
- Documentation: For higher-value purchases, independent gemological identification can provide additional confidence.
- Seller policies: Check return, warranty, repair, and after-sale service policies.
What Is Tanzanite?
Tanzanite is the blue-to-violet gemstone variety of zoisite. It became known internationally after its discovery in Tanzania in the 1960s and was subsequently introduced to the global jewelry market.
One of Tanzanite's most distinctive optical properties is pleochroism. This means the gemstone can display different colors or color intensities when viewed from different crystal directions. Depending on orientation and treatment, a Tanzanite may show blue, violet, or other color components.
Its combination of distinctive color and a highly limited geographic source has helped Tanzanite become popular in rings, earrings, pendants, necklaces, and December birthstone jewelry.
Where Does Tanzanite Come From?
Commercial Tanzanite production is concentrated in a limited mining area in northern Tanzania near Mount Kilimanjaro. This highly restricted source is one of the features that makes Tanzanite unusual among popular colored gemstones.
Because commercial supply comes from one region, buyers sometimes encounter exaggerated claims that Tanzanite will disappear entirely within a specific number of years. Such predictions should be treated cautiously unless supported by current geological and mining-resource data.
Why Is Tanzanite Special?
Tanzanite attracts buyers for several reasons:
- It occurs commercially in one highly restricted geographic region.
- It displays attractive blue-to-violet colors.
- It can show strong pleochroism.
- It is recognized as a December birthstone.
- Its color can appear different under different lighting conditions.
- Large, strongly saturated stones can be visually impressive.
How to Buy Tanzanite: Understanding the 4Cs
Like many colored gemstones, Tanzanite can be evaluated using four familiar characteristics: Color, Clarity, Cut, and Carat Weight. However, these factors do not contribute equally. For Tanzanite, color is often one of the most influential value factors.
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Tanzanite Color: Usually the Most Important Value Factor
- Hue: Whether the gemstone appears more blue, more violet, or somewhere between the two.
- Tone: How light or dark the gemstone appears.
- Saturation: How strong, vivid, or intense the color appears.
Tanzanite Clarity: What Should You Look For?
- Large eye-visible inclusions
- Surface-reaching fractures
- Chips around facet junctions or edges
- Cloudy areas that reduce transparency
- Damage around prongs in pre-set jewelry
Tanzanite Cut: How to Judge It
Tanzanite Carat Weight: Is Bigger Always Better?
Tanzanite is best known for colors ranging from violet-blue to blue-violet. Fine stones typically show attractive saturation and a lively face-up appearance.
When comparing Tanzanite, look at three aspects of color:
A strongly saturated stone with an attractive blue-to-violet face-up color will generally be more desirable than a pale or grayish stone of the same size.
Blue Tanzanite vs. Violet Tanzanite
Both blue-dominant and violet-dominant Tanzanites can be beautiful. Blue-dominant stones may sometimes command a premium, particularly when the color is vivid and well saturated, but personal preference should also influence your purchase.
A buyer should therefore compare the overall appearance rather than choosing a gemstone only because a seller labels it "blue" or "violet."
Check Tanzanite Under More Than One Light Source
Tanzanite can look noticeably different under daylight, warm indoor light, and jewelry-store lighting. When possible, evaluate the gemstone under more than one light source or review product photos taken under realistic lighting conditions.
Be cautious if a listing uses heavily edited or extremely saturated images that may not accurately represent the gemstone's everyday appearance.
Most fine-quality faceted Tanzanite used in jewelry is expected to appear eye-clean, meaning inclusions are not easily visible without magnification.
Small internal characteristics do not automatically make a gemstone undesirable. However, obvious inclusions can reduce visual appeal, and fractures deserve particular attention because they may also affect durability.
Before Buying, Check For:
When buying online, use high-resolution images and videos where available and ask the seller about eye-visible inclusions if the listing does not clearly describe clarity.
A good cut helps Tanzanite show attractive color, brightness, symmetry, and face-up size. The goal is not simply to preserve maximum carat weight from the rough gemstone.
A well-cut Tanzanite should generally appear balanced and lively when viewed face-up.
Too Shallow
A very shallow cut can create a transparent-looking area through the center known as a window. This can make the gemstone look less saturated and less lively.
Too Deep
A very deep stone may hide excessive weight below the setting and appear smaller face-up than another Tanzanite of similar carat weight.
Well Proportioned
A well-proportioned Tanzanite balances depth, spread, symmetry, color, and light return so that the gemstone looks attractive from normal viewing positions.
Simple Buying Test: Tilt the Tanzanite gently under normal light. A well-cut gemstone should appear lively across most of its face rather than showing a large transparent center or excessive dark areas.
No. Carat measures gemstone weight, not quality.
Larger Tanzanites can sometimes display stronger color because a greater depth of material may allow color to appear more saturated. However, a large stone with weak color, poor clarity, or an unattractive cut may be less desirable than a smaller stone with excellent overall quality.
When comparing two Tanzanites, look at both carat weight and millimeter dimensions. Two gemstones with the same weight can face up at noticeably different sizes depending on their proportions.
If you're considering a larger center stone for a Tanzanite engagement ring, compare its face-up dimensions, setting protection, and overall cut rather than focusing on carat weight alone.
Does Tanzanite Have an Official Grading System?
Tanzanite does not have a universally standardized quality grading system comparable to the GIA diamond grading scale.
You may see commercial descriptions such as:
- A
- AA
- AAA
- AAAA
- Premium
- Heirloom
These terms are generally seller-specific or proprietary descriptions. Their meaning can vary considerably from one company to another.
For that reason, a buyer should not compare an "AAA Tanzanite" from one seller directly with an "AAA Tanzanite" from another seller unless both companies clearly define their quality criteria.
What Does AAA Tanzanite Mean?
There is no universal gemological definition of "AAA Tanzanite." A retailer may use AAA to describe a certain combination of color, clarity, and cut, but another seller may apply the same label differently.
Instead of relying only on letter grades, compare measurable and visible factors such as:
- Color saturation
- Hue
- Clarity
- Cut quality
- Carat weight
- Dimensions
- Treatment disclosure
- Independent gemological documentation where appropriate
Can GIA or Another Laboratory Evaluate Tanzanite?
Yes. Reputable gemological laboratories can identify Tanzanite and report important gemstone characteristics. What they generally do not provide is a universal quality grade such as AAA or AAAA.
For example, a laboratory identification report may include information such as:
- Whether the material is natural or laboratory-grown
- Gemstone type
- Weight
- Measurements
- Shape
- Cutting style
- Color description
- Detectable treatment information where applicable
For a high-value loose Tanzanite or important jewelry purchase, an independent laboratory report can provide additional confidence.
Is Tanzanite Heat-Treated?
Most Tanzanite sold in the jewelry market has been heat-treated.
Untreated Tanzanite rough commonly contains brownish, greenish, violet, or mixed color components. Controlled heating can reduce unwanted brownish coloration and reveal or strengthen the blue-to-violet colors for which Tanzanite is best known.
Heat treatment is routine and widely accepted in the Tanzanite market.
Is Every Tanzanite Heat-Treated?
No. It is inaccurate to say that every Tanzanite must have been artificially heated. Some Tanzanite can acquire blue coloration through natural geological heating, and determining whether heating occurred naturally or after mining may not always be possible.
For buyers, the more important issue is transparency. A reputable seller should disclose known or reasonably detectable treatments in accordance with applicable jewelry-industry practices.
Are There Other Tanzanite Treatments?
Heat treatment is by far the treatment most commonly associated with Tanzanite. Other treatments, such as surface coating or fracture filling, are much less common but may occasionally be encountered.
A useful question to ask before purchasing is:
"Has this Tanzanite received any treatment other than routine heating?"
If unusual treatments are present, ask how they affect appearance, durability, value, cleaning, and future repairs.
How Can You Tell if Tanzanite Is Real?
Visual appearance alone is not enough to conclusively identify Tanzanite.
Characteristics such as blue-violet color and pleochroism can provide clues, but other natural gemstones, laboratory-grown materials, or simulants may create a similar appearance.
The most reliable approach for an important purchase is a combination of:
- Buying from a reputable seller
- Clear product disclosure
- Accurate gemstone description
- Return and warranty policies
- Independent gemological testing when appropriate
Avoid relying on internet "home tests" that claim to prove authenticity using scratching, heating, household chemicals, or other potentially damaging methods.
What Makes Tanzanite Valuable?
Tanzanite value depends on a combination of characteristics rather than one factor alone.
Important factors include:
- Color: Strong saturation and an attractive blue-violet appearance generally increase desirability.
- Clarity: Eye-clean stones are usually preferred for faceted jewelry.
- Cut: Good cutting improves appearance, color presentation, and face-up beauty.
- Carat weight: Larger high-quality stones can command significantly higher prices.
- Treatment: Treatment type and disclosure can affect buyer confidence and value.
- Dimensions: Face-up size matters in addition to weight.
- Condition: Chips, fractures, and abrasion can reduce value.
- Jewelry craftsmanship: Metal, setting quality, accent stones, and workmanship affect the final jewelry price.
Why Do Tanzanite Prices Vary So Much?
Two Tanzanites of equal carat weight can have very different prices because they may differ substantially in color, clarity, cut, dimensions, condition, and overall visual appeal.
For example, a strongly saturated, eye-clean, well-cut Tanzanite can command considerably more than a similar-sized stone with pale color, obvious inclusions, or poor proportions.
This is why judging Tanzanite only by price per carat can be misleading.
Tanzanite Jewelry: Which Type Is Best?
Tanzanite can be worn in many styles of jewelry, but some designs expose the gemstone to less impact than others.
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Tanzanite Rings
Tanzanite rings can be striking because the gemstone's blue-violet color is highly visible on the hand. However, rings experience more impact than earrings or pendants, so setting design matters.
Tanzanite Earrings
Tanzanite earrings are an excellent choice for buyers who want vivid gemstone color with relatively low risk of accidental impact. Tanzanite works well in studs, drops, hoops, and dangle styles.
Tanzanite Necklaces and Pendants
Tanzanite necklaces and pendants allow the gemstone's blue-to-violet color to become the focus of the design while keeping it away from many of the knocks that rings encounter.
Tanzanite Bracelets
Tanzanite bracelets can be beautiful but require thoughtful design because the wrist is frequently exposed to desks, doors, and other hard surfaces. Protective settings are especially useful.
Is Tanzanite Good for an Engagement Ring?
Yes, Tanzanite can be used in an engagement ring, but it requires more careful wear than harder gemstones such as diamond or sapphire.
Tanzanite has a Mohs hardness of approximately 6–7 and also has cleavage, which means a hard impact in an unfavorable direction can damage the gemstone.
If you choose a Tanzanite engagement ring, consider:
- A protective setting
- A lower-profile design
- Secure prongs
- A halo surrounding the center stone
- A bezel or partial bezel where appropriate
Remove Tanzanite rings during exercise, gardening, cleaning, heavy lifting, sports, or other activities where the stone could be struck.
Best Settings for Tanzanite Rings
Bezel Setting
A bezel surrounds much or all of the gemstone edge with metal, helping protect vulnerable areas from accidental impact.
Halo Setting
A halo can add visual presence while providing some additional protection around the center gemstone.
Secure Prong Setting
Well-positioned prongs can hold Tanzanite securely, although exposed edges may still remain vulnerable to impact.
Lower-Profile Setting
A lower setting keeps the gemstone closer to the finger and can reduce the chance of catching it on clothing or objects.
Tanzanite vs. Blue Sapphire
Tanzanite and blue sapphire can both display beautiful blue colors, but they are very different gemstones.
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Tanzanite should therefore not be viewed simply as a "replacement" for blue sapphire. Each gemstone has its own appearance, durability, origin, and value characteristics.
Questions to Ask Before Buying Tanzanite
Before making a significant purchase, ask the jeweler or seller:
- Is this natural Tanzanite?
- Has the gemstone been heat-treated?
- Has it received any treatment other than heat?
- What is the exact carat weight?
- What are the millimeter dimensions?
- Are there any eye-visible inclusions?
- Are there any fractures, chips, or durability concerns?
- Is the color more blue-dominant or violet-dominant?
- Does the gemstone come with an independent laboratory report?
- What is the return policy?
- What warranty or after-sale service is included?
- If this is a ring, how does the setting protect the Tanzanite?
Tanzanite Buying Red Flags
Be cautious when a seller:
- Claims that AAA or AAAA is an official universal Tanzanite grade.
- Does not disclose known treatments.
- Guarantees that Tanzanite will increase in value.
- Provides no carat weight or dimensions.
- Uses dramatically oversaturated photographs.
- Calls Tanzanite unbreakable or ideal for rough everyday wear.
- Claims every Tanzanite in existence is artificially heat-treated.
- Claims no gemological laboratory can identify or evaluate Tanzanite.
- Provides vague or misleading "certification" without naming the issuing organization.
- Offers an unusually large, intensely colored gemstone at a price that seems inconsistent with comparable stones without explaining why.
Is Tanzanite a Good Investment?
Tanzanite can be valuable and collectible, but it should primarily be purchased for its beauty, rarity of source, craftsmanship, and personal significance rather than with an assumption of guaranteed financial appreciation.
Gemstone resale value can depend on:
- Quality
- Condition
- Documentation
- Market demand
- Dealer margins
- Transaction costs
- Availability of buyers
No reputable seller should promise that a Tanzanite purchase will produce a guaranteed return.
Tanzanite as a December Birthstone
Tanzanite is recognized as one of the birthstones associated with December, along with turquoise and zircon.
Its intense blue-violet color makes it a popular choice for December birthstone jewelry, birthday gifts, and personalized jewelry.
Tanzanite Meaning and Symbolism
In modern gemstone symbolism and spiritual traditions, Tanzanite is often associated with transformation, intuition, calmness, communication, and new beginnings.
These symbolic meanings can be personally meaningful, but they should be understood as cultural, spiritual, or metaphysical traditions rather than scientifically established physical or medical effects.
How to Clean Tanzanite Jewelry
Tanzanite requires gentle care because it is softer and less tough than gemstones such as diamond, sapphire, and ruby.
Safe Cleaning Method
- Prepare lukewarm water with a small amount of mild soap.
- Gently clean the jewelry using a soft cloth or very soft brush.
- Rinse carefully with clean lukewarm water.
- Pat dry with a soft, lint-free cloth.
Important: Avoid ultrasonic cleaners and steam cleaners for Tanzanite jewelry. Vibrations, heat, or sudden temperature changes may damage vulnerable gemstones.
How to Store and Protect Tanzanite
- Store Tanzanite separately from harder gemstones that could scratch it.
- Use a soft pouch or fabric-lined jewelry box.
- Avoid hard knocks and impact.
- Remove Tanzanite rings during exercise, cleaning, gardening, or heavy work.
- Avoid sudden temperature changes and very high heat.
- Have prongs and settings checked periodically by a professional jeweler.
Tanzanite is generally stable under normal light exposure, so ordinary daylight is not the primary care concern. Physical impact, excessive heat, and improper cleaning are more important risks.
Design a Ring That Feels Like Your Story
Make your proposal unforgettable with the captivating beauty of our tanzanite engagement rings. From classic solitaire settings to intricate designs that beautifully complement the gemstone.
Frequently Asked Questions About Buying Tanzanite
What color Tanzanite is most valuable?
Strongly saturated blue-to-violet Tanzanite is generally the most desirable. Fine stones often show vivid violetish-blue or bluish-violet color with good transparency and an attractive face-up appearance.
Is blue Tanzanite better than purple Tanzanite?
Not necessarily. Blue-dominant Tanzanite may sometimes command a premium, but strongly saturated violet-blue Tanzanite can also be highly attractive. Overall saturation, clarity, cut, and personal preference matter more than choosing color based on a single label.
Is all Tanzanite heat-treated?
No. Most Tanzanite sold in the jewelry market has been heat-treated, but some material may have experienced natural geological heating. Heat treatment is routine and widely accepted.
Does GIA grade Tanzanite?
GIA can identify Tanzanite and report characteristics such as weight, measurements, color, cutting style, and detectable treatments, but it does not assign a universal quality grade such as AAA or AAAA.
What does AAA Tanzanite mean?
AAA is generally a retailer-defined quality description rather than a universal gemological grade. Its meaning can vary between sellers, so buyers should compare actual color, clarity, cut, carat weight, dimensions, and treatment disclosure.
How can I tell if Tanzanite is real?
Visual appearance alone cannot reliably prove that Tanzanite is genuine. For important purchases, buy from a reputable seller and consider independent gemological identification rather than relying on home tests.
Is Tanzanite durable enough for everyday wear?
Tanzanite can be worn regularly with care, but its approximate Mohs hardness of 6–7 and its cleavage make it more vulnerable to scratches and impact than diamond or sapphire. Earrings and pendants generally face less impact than rings and bracelets.
Can Tanzanite be used in an engagement ring?
Yes, Tanzanite can be used in an engagement ring, but a protective setting and careful wear are recommended because the gemstone can be damaged by hard impacts.
Does Tanzanite scratch easily?
Tanzanite is more vulnerable to scratching than harder gemstones such as sapphire and diamond. Store it separately and avoid abrasive contact with harder jewelry.
How should Tanzanite be cleaned?
Clean Tanzanite gently with mild soap, lukewarm water, and a soft cloth or brush. Avoid ultrasonic and steam cleaners, excessive heat, and sudden temperature changes.
Is Tanzanite a good investment?
Tanzanite may be valuable and collectible, but it should not be purchased with an assumption of guaranteed appreciation. Buy it primarily for gemstone quality, beauty, personal meaning, and craftsmanship.
Is Tanzanite a December birthstone?
Yes. Tanzanite is one of December's recognized birthstones, alongside turquoise and zircon.
Final Tanzanite Buying Advice
The best Tanzanite is not necessarily the biggest stone or the one carrying the highest retailer-created grade. A smart purchase balances color, clarity, cut, carat weight, dimensions, treatment disclosure, durability, setting quality, and budget.
For many buyers, a strongly saturated, eye-clean Tanzanite with a lively cut will provide more beauty than a larger gemstone with weak color or poor proportions.
If you are buying Tanzanite for a ring, pay particular attention to the setting and your lifestyle. If you prefer jewelry with lower impact risk, earrings and pendants are excellent ways to enjoy Tanzanite's distinctive blue-violet color.
Most importantly, buy from a seller that clearly describes the gemstone, discloses known treatments, provides useful images and specifications, and supports the purchase with transparent return and after-sale policies.
References
Gemological facts in this guide were reviewed against educational information from the Gemological Institute of America (GIA).
Editorial note: Tanzanite symbolism and metaphysical associations are presented as cultural or personal traditions rather than scientifically established effects. Commercial quality descriptions such as A, AA, AAA, or AAAA are not universal gemological grades and may vary between sellers.