Choosing a beautiful Tanzanite gemstone involves much more than simply finding the darkest blue stone or the highest carat weight. Color, clarity, cut, carat weight, treatment, durability, and documentation can all influence how attractive and suitable a Tanzanite is for you.
Tanzanite is the blue-to-violet variety of the mineral zoisite and is commercially mined in the Merelani area of northern Tanzania, near Mount Kilimanjaro. Its limited geographic source, distinctive blue-violet color, and strong pleochroism make it one of the most recognizable colored gemstones used in modern jewelry.
If you are comparing loose Tanzanite or Tanzanite jewelry, this guide will show you exactly what to examine, which quality claims deserve closer attention, and what questions to ask before buying.
Quick Answer: A high-quality Tanzanite generally combines an attractive, well-saturated violet-blue or blue-violet color, good transparency with no distracting eye-visible inclusions, a lively and symmetrical cut, and a size that suits your preferences and budget. Carat weight alone does not determine quality, and labels such as “AAA” should never replace an evaluation of the actual gemstone.
What Makes a Good-Quality Tanzanite?
Tanzanite does not become high quality because of one characteristic alone. Buyers should evaluate the gemstone as a combination of color, clarity, cut, and carat weight, while also considering treatment disclosure, durability, and how the stone will be worn.
|
According to the Gemological Institute of America (GIA), deeply saturated violet-blue to blue-violet Tanzanites are among the most valued, while eye-visible inclusions generally reduce value. Cut quality also has a significant effect on beauty and brilliance.
1. How to Evaluate Tanzanite Color
Color is one of the most important visual factors when choosing Tanzanite. Fine stones can show richly saturated violetish-blue or bluish-violet colors. However, “the darkest stone is always the best” is an oversimplification.
When evaluating color, look at three characteristics:
- Hue: Whether the gemstone appears predominantly blue, violet, or a combination of the two.
- Tone: How light or dark the gemstone appears.
- Saturation: How strong and vivid the color appears rather than washed out or grayish.
An attractive Tanzanite should display enough saturation to look rich and lively without becoming so dark that its brilliance disappears. Personal preference also matters. Some buyers prefer a predominantly blue appearance, while others are attracted to Tanzanite's stronger violet component.
Why Does Tanzanite Show Different Colors?
Tanzanite is strongly pleochroic. This means its color can appear different when the gemstone is viewed from different directions. A fashioned Tanzanite commonly shows varying amounts of blue and violet depending on its orientation, cut, and lighting.
That color variation is a normal optical characteristic of Tanzanite. However, pleochroism alone should not be used as a do-it-yourself authenticity test. If the identity of a valuable gemstone is uncertain, professional gemological testing is more dependable than judging color with the eye alone.
For a deeper explanation of hue, tone, saturation, and blue-versus-violet appearances, read our guide to the best color of Tanzanite.
Does Lighting Affect Tanzanite?
Yes. Tanzanite may appear somewhat different under daylight, neutral white lighting, and warmer indoor lighting. For that reason, compare the gemstone in more than one lighting environment whenever possible.
When shopping online, photographs can also be affected by camera settings, studio lighting, editing, and your device display. A trustworthy listing should therefore provide useful specifications instead of asking you to judge quality from a highly edited photograph alone.
2. How to Check Tanzanite Clarity
Clarity describes the presence and visibility of internal characteristics called inclusions and external surface features called blemishes.
Many desirable Tanzanites appear eye-clean, meaning distracting inclusions are not obvious to the unaided eye under normal viewing conditions. Eye-visible inclusions may reduce the beauty and value of a stone, particularly when they are located prominently beneath the table facet.
It is important, however, not to assume that every inclusion is artificial or caused by damage. Natural gemstones can contain natural inclusions. The more important question is whether an inclusion affects appearance, transparency, or structural durability.
Pay Particular Attention to Fractures
Fractures that reach the surface or occur near vulnerable areas deserve greater attention because Tanzanite has cleavage and is not as tough as gemstones such as sapphire.
When examining a loose stone or jewelry piece, look for:
- Large fractures visible without magnification
- Cracks extending toward the edge or corners
- Cloudy areas that reduce transparency
- Dark inclusions that distract from the face-up appearance
- Surface-reaching features close to prongs or exposed edges
A tiny inclusion visible only under magnification does not automatically make a Tanzanite undesirable. Evaluate clarity together with color, cut, size, durability, and price.
3. How to Evaluate the Cut of Tanzanite
Cut should not be confused with shape. Shape refers to outlines such as oval, cushion, pear, round, or trillion, while cut quality describes how successfully the gemstone has been proportioned, faceted, and polished.
A well-cut Tanzanite should look lively when moved under light. Facets should work together to return light attractively across the stone instead of producing a lifeless center or large permanently dark areas.
Check for Windowing
A “window” is a pale or transparent-looking area, often near the center of a gemstone, through which you may appear to see straight through the stone. Severe windowing can make Tanzanite appear washed out and can reduce its visual impact.
Check for Excessive Extinction
Extinction refers to areas that look very dark because little light is returning to the viewer. Some dark contrast can add depth, but excessive extinction can hide Tanzanite's color and reduce brilliance.
Examine Symmetry and Polish
Look at whether the outline appears balanced, the facets meet neatly, and the surface appears well polished. Avoid judging a gemstone solely by whether it has a fashionable shape.
Tanzanite's cutting orientation is particularly important because the direction in which the rough crystal is cut can influence whether the finished gemstone appears more blue or more violet face-up.
If you are deciding between oval, cushion, round, pear, princess, and other shapes, see our detailed guide to choosing a Tanzanite cut.
4. Does Bigger Tanzanite Mean Better Quality?
No. Carat weight measures weight, not overall gemstone quality.
A larger Tanzanite can be more valuable when other characteristics are comparable, but a large gemstone with poor clarity, weak color, obvious fractures, or an unattractive cut is not automatically better than a smaller, beautifully cut stone.
Size and color can nevertheless be related in Tanzanite. Larger stones are more likely to display deeper saturation, while small accent stones commonly appear lighter. This is one reason it is important to compare Tanzanites within a similar size range rather than expecting a small stone to display exactly the same depth of color as a much larger gemstone.
Also remember that two stones with the same carat weight may have different face-up dimensions depending on their proportions and shape. When buying online, compare both carat weight and millimeter measurements.
5. Is Heat-Treated Tanzanite Good Quality?
Yes. Heat treatment is routine and widely accepted for Tanzanite.
Much Tanzanite material naturally has a brownish component before heating. Controlled heating is routinely used to develop the blue-to-violet appearance associated with the gemstone. According to GIA, this treatment is stable and does not introduce additional durability concerns.
Therefore, seeing “heated” or “heat treated” in a Tanzanite description should not automatically be interpreted as a defect.
The more important consideration is treatment disclosure. Ask whether the stone has undergone treatments beyond routine heating, such as coating or fracture filling. These treatments are much less common and may affect care requirements or long-term appearance.
You can read GIA's current treatment and care guidance in its Tanzanite Care and Cleaning Guide.
6. What Does AAA Tanzanite Mean?
You may see Tanzanite advertised using terms such as A, AA, AAA, AAAA, premium, exceptional, or heirloom quality. These descriptions can be useful within a seller's own inventory, but they are not a universally standardized Tanzanite grading system.
Important: There is no universal gemological standard that guarantees every gemstone described as “AAA Tanzanite” will have identical color, clarity, cut, or value. Always examine the actual specifications and appearance of the gemstone instead of buying based on the grade label alone.
GIA specifically notes that individual companies may create their own A, AA, or AAA quality descriptions, but no standard quality-grading scale exists for Tanzanite.
When a retailer uses its own Tanzanite grades, ask what measurable or observable criteria distinguish one grade from another. A meaningful description should still address the actual gemstone's color, clarity, cut, dimensions, carat weight, and treatments.
7. Should Tanzanite Have a Gemological Report?
A document supplied with jewelry can mean different things, so it is useful to distinguish between a seller's certificate or authenticity documentation and an independent gemological laboratory report.
A seller's documentation may record information supplied by the jeweler, such as gemstone type, metal, estimated weight, or product specifications. An independent gemological laboratory report involves examination by the issuing laboratory.
For an important or higher-value Tanzanite purchase, an independent laboratory report can provide additional information about the material being examined. For example, GIA states that its Colored Stone Identification Report can record characteristics such as measurements, shape, cutting style and color, identify whether material is natural or laboratory-grown, and disclose detectable treatments.
GIA does not assign Tanzanite an AAA quality grade. This distinction is useful when comparing marketing terminology with laboratory identification.
Whether an independent report is worthwhile depends on the value of the purchase, the documentation already provided, and the level of assurance you want.
8. How to Evaluate Tanzanite When Buying Online
Online shopping prevents you from inspecting the gemstone in person before purchase, so the product page needs to do more of the work for you.
Before choosing Tanzanite online, check the following information:
- Exact gemstone type: The listing should clearly identify Tanzanite rather than relying only on a blue gemstone image.
- Carat weight: Check whether the stated weight applies to one stone or represents a total gemstone weight.
- Dimensions: Millimeter measurements help you understand the gemstone's visible size.
- Color information: Compare description, photographs, and video if available.
- Clarity information: Determine whether significant inclusions or fractures are disclosed.
- Cut or shape: Make sure the shape and cutting style match the design you want.
- Treatments: Routine heat treatment should be disclosed when known, along with any other detectable treatments.
- Documentation: Understand whether the product includes seller documentation, an authenticity certificate, or an independent laboratory report.
- Return policy: Make sure you have a reasonable opportunity to inspect the jewelry after delivery.
- Seller information: Buy from a retailer that provides clear product information and accessible customer support.
Ask for More Than One Image
Tanzanite can look different according to viewing angle and lighting. Multiple photographs or a video can therefore be more useful than one highly edited hero image.
If possible, evaluate the gemstone in neutral lighting as well as normal indoor lighting after you receive it.
Do Not Authenticate Tanzanite From a Photograph Alone
Color and pleochroism can provide useful observations, but they cannot conclusively prove that a blue-violet gemstone is natural Tanzanite. Similar-looking materials can exist, and treatments may not be obvious to the eye.
For a more detailed discussion of identification, see how to identify real Tanzanite. For higher-value purchases where identity is important, professional gemological testing provides stronger evidence than home tests.
9. Tanzanite Red Flags to Avoid
|
10. Choosing Tanzanite for Rings, Earrings, Pendants, and Bracelets
Gemstone quality is only part of the buying decision. You should also consider how exposed the Tanzanite will be during normal wear.
Tanzanite ranks approximately 6 to 7 on the Mohs hardness scale and has fair-to-poor toughness because its cleavage can make it vulnerable to hard impacts. That does not prevent Tanzanite from being used in jewelry, but it does mean the design and wear habits matter.
|
For additional durability guidance, read Can Tanzanite Chip Easily? and Can We Wear Tanzanite Jewelry Every Day?.
How Should You Clean Tanzanite?
Warm, mild soapy water is a safer choice for routine cleaning. GIA does not recommend ultrasonic or steam cleaners for Tanzanite. Avoid hard blows, sudden temperature changes, and harsh treatment when wearing or cleaning the gemstone.
11. Tanzanite Buying Checklist
Before completing a Tanzanite purchase, use this checklist as a final review:
- Color: Does the stone have a pleasing blue-violet or violet-blue appearance rather than simply being the darkest option?
- Saturation: Does the color look rich and lively rather than weak, grayish, or overly dark?
- Clarity: Are there distracting inclusions or fractures visible without magnification?
- Cut: Does the stone return light attractively without a large central window or excessive dark areas?
- Symmetry: Does the shape look balanced and well finished?
- Carat: Are you choosing an appropriate size without sacrificing the factors that matter more to appearance?
- Dimensions: Have you checked millimeter measurements as well as carat weight?
- Treatment: Does the seller clearly disclose known treatments?
- Quality label: If the stone is called AAA or another commercial grade, do you understand what that seller's terminology means?
- Documentation: Do you understand whether you are receiving seller documentation or an independent laboratory report?
- Setting: Is the design protective enough for how frequently you plan to wear the jewelry?
- Seller: Are product details, customer support, and return information clearly available?
Best rule to remember:
Do not choose Tanzanite from one number or marketing label alone. The best choice is the gemstone that gives you the strongest overall combination of appealing color, clean appearance, lively cut, suitable size, transparent treatment information, and an appropriate setting for the way you intend to wear it.
Design a Ring That Feels Like Your Story
Make your proposal unforgettable with a Tanzanite engagement ring. Explore elegant designs featuring striking blue-violet Tanzanite gemstones, crafted to bring distinctive color & brilliance
Frequently Asked Questions About Choosing Tanzanite
What color Tanzanite is considered high quality?
Deeply saturated violet-blue and blue-violet colors are highly valued. However, the stone should still look lively rather than so dark that its brilliance and color become difficult to see. Some buyers also prefer more violet while others prefer a predominantly blue appearance.
Is darker Tanzanite always better?
No. Strong saturation can increase desirability, but darkness and saturation are not the same thing. A gemstone that appears almost black in normal lighting may show less visible color and brilliance than a slightly lighter but more vivid Tanzanite.
Does a larger Tanzanite mean better quality?
No. Carat weight measures weight rather than quality. Larger Tanzanites can display deeper color, but color, clarity and cut still need to be evaluated. A smaller well-cut Tanzanite can be more visually appealing than a larger poorly cut or heavily fractured stone.
What does AAA Tanzanite mean?
AAA is generally a retailer or supplier's own quality description. There is no universal standardized A, AA or AAA grading system for Tanzanite, so compare the actual gemstone characteristics rather than assuming every AAA stone is equivalent.
Does GIA grade Tanzanite as AAA?
No. GIA evaluates and identifies Tanzanite but does not assign it an AAA-style quality grade. Its colored stone identification reports can document characteristics and identify detectable treatments.
Is heat-treated Tanzanite considered natural Tanzanite?
Heat treatment is routinely used with natural Tanzanite to modify its brownish component and develop its familiar blue-to-violet appearance. Routine heating is widely accepted in the gemstone market. Treatment disclosure remains important.
Can I tell whether Tanzanite is real at home?
You may observe characteristics such as color variation and pleochroism, but home observations cannot conclusively authenticate an important gemstone. Professional gemological examination or an independent laboratory report offers stronger evidence when identity is in doubt.
Should Tanzanite be completely flawless?
Not necessarily. Natural Tanzanite can contain inclusions. What matters to most buyers is whether inclusions are distracting to the unaided eye or create durability concerns. Large fractures are more concerning than tiny internal features visible only under magnification.
Is Tanzanite suitable for an engagement ring?
It can be used in an engagement ring, but Tanzanite requires more careful wear than tougher gemstones such as sapphire. A protective setting and sensible daily-wear habits can reduce the risk of accidental damage. Explore our Tanzanite engagement rings for design inspiration.
What is the safest way to clean Tanzanite jewelry?
Warm water with mild soap is suitable for routine cleaning. Avoid ultrasonic and steam cleaners, and do not expose Tanzanite to hard knocks or sudden temperature changes.
What should I prioritize if my budget is limited?
Prioritize the qualities you can see and enjoy. An attractive color, eye-clean appearance, and lively cut usually have greater visual impact than choosing the largest possible carat weight. Compare several stones within your budget before deciding.
Final Thoughts: Choosing the Right Tanzanite
The best Tanzanite is not simply the largest stone, the darkest stone, or the one carrying the highest-sounding commercial grade. A confident buying decision comes from understanding how color, clarity, cut, carat weight, treatment, documentation, and durability work together.
Start by judging the gemstone's color and liveliness. Check for distracting inclusions or fractures. Examine whether the cut returns light attractively. Compare carat weight with actual dimensions. Confirm known treatments, and understand exactly what any retailer-specific grade means.
Finally, match the Tanzanite and setting to how you intend to wear the jewelry. A pendant or pair of earrings has different durability demands than a ring worn frequently on the hand.
If you would like an even broader overview covering the gemstone, purchasing considerations, jewelry, and care, continue with our Ultimate Tanzanite Buying Guide.
Expert References
This guide uses established gemological guidance to explain Tanzanite quality, treatment, grading terminology, and care.
- Gemological Institute of America — Tanzanite Gem Encyclopedia
- Gemological Institute of America — Tanzanite Buyer's Guide
- Gemological Institute of America — Tanzanite Care and Cleaning Guide
Editorial note: Gemstone appearance can vary by lighting, viewing angle, photography, display settings, and individual stones. Commercial quality terms may also differ between sellers. For important purchases where gemstone identity or treatment is uncertain, consider an independent gemological laboratory report.