Tanzanite Earrings Buying Guide: Natural vs Simulated, Size, Gold and Settings

Two tanzanite earring photos can look nearly identical on a phone screen and still represent very different purchases. One listing may hold mined tanzanite set in solid 18K white gold; another may hold a non-mined, color-matched stone in gold-plated sterling silver. Retailer category pages for this search span studs, drops and hoops, from jewelry-chain assortments at Zales to marketplace listings at Etsy, where mined, treated and non-mined stones all appear side by side. Tanzanite is one of December's birthstones (GIA), and it is listed for the 24th wedding anniversary by Jewelers of America (Jewelers of America). Whether you are buying for yourself or as a gift, this guide is built around one question: what does the listing in front of you actually prove? Work through the sections below and you can compare any two pairs on identity, treatment, measurable size, metal construction and documentation, instead of on photography alone.

Natural, laboratory-created and simulated tanzanite earrings

Tanzanite is a blue-to-violet variety of zoisite (American Gem Society), and it has one commercial source: the Merelani Hills of northern Tanzania (GIA).

When you compare listings, three different categories can sit under the word "tanzanite," and US Federal Trade Commission rules treat them very differently.

A natural tanzanite is mined from the earth. Most natural tanzanite sold today has been heat-treated to develop its blue-to-violet color, and that treatment is standard and stable; it does not change the stone's status as natural tanzanite (GIA; GIA).

A laboratory-created (or "synthetic") tanzanite is grown rather than mined, and FTC rules permit that specific name only when the grown material has essentially the same optical, physical and chemical properties as mined tanzanite (16 CFR 23.25). That is a specific, testable standard, not a marketing description. The sources used for this guide do not document a commercially available laboratory-created tanzanite meeting that same-properties standard. If a seller uses the term "laboratory-created tanzanite," it is reasonable to ask what laboratory testing supports that the stone actually meets the same-properties standard, rather than simply resembling tanzanite in color.

A simulated or imitation stone — such as cubic zirconia, glass, or a different mineral cut and colored to resemble tanzanite — does not share tanzanite's optical, physical and chemical properties. It is a different material, and it is not interchangeable with either natural or properly substantiated laboratory-created tanzanite. FTC guidance requires that a non-mined, non-matching stone be identified with an equally conspicuous qualifier such as "simulated" or "imitation" immediately before the gemstone name, every time the name is used (16 CFR 23.25). The FTC's current guidance on advertising diamonds, gemstones and pearls confirms this same distinction: laboratory-created and simulated are not the same claim, and a stone that merely looks similar is not an established synthetic version of the named gem.

In practice, a product titled only "tanzanite earrings" should hold mined tanzanite, while a stone cut and colored only to resemble tanzanite should be labeled simulated tanzanite earrings everywhere it appears — in headings, product titles, image alt text and at checkout. Awareness Avenue keeps its natural tanzanite jewelry collection and its simulated tanzanite collection separate for that reason; check the stone identity stated on each individual product page before ordering, because the underlying materials, and the rules governing how each may be named, are different.

Coating and fracture filling have also been documented in tanzanite, although GIA describes both as uncommon (GIA). Before you buy, ask the seller to state, for your exact variant, whether the stone is natural, laboratory-created or simulated, and whether it is heated, coated, fracture-filled or untreated.

How to judge tanzanite quality

GIA evaluates tanzanite but does not grade it (GIA), so an "AAA" or "AAAA" label on a listing is a seller convention, not a laboratory grade. Face-up color, visible inclusions, cut and size are the factors GIA identifies as useful points of comparison for tanzanite.

Color

Intense violet-to-blue face-up colors contribute substantially to value; paler colors are more common and less valued (GIA). Tanzanite is pleochroic and can display different colors in different crystal directions (GIA). That pleochroism describes direction-dependent color inside the crystal; it is not a guarantee that a given pair will visibly swing between two colors under ordinary room lighting. Treat dramatic "blue by day, violet by candlelight" copy as a description of the general phenomenon, not a promise about your exact stones, unless the seller provides consistent-light video of that specific pair.

Clarity

Eye-visible inclusions and fractures can reduce value (GIA). Ask for a close-up photograph of each stone in the actual pair you are buying rather than a stock macro image, since clarity varies stone to stone even within one listing.

Cut

Cut orientation affects face-up color, and good cutting should return light evenly (GIA). On screen or in video, watch for a pale "window" through the center of the stone or heavy dark zones near the edges, both of which indicate less even light return.

Size and saturation

The finest, deepest colors are usually found in stones above five carats (GIA). Smaller tanzanites tend to be less saturated, which matters specifically for earrings, because stud-scale center stones are small by design. If you want depth of color at a modest face-up size, prioritize a written color description and consistent-light video over carat-weight alone.

What size tanzanite studs should you buy?

Gemstone earring listings commonly express weight as a total figure — "ctw" or "ct. t.w." — which may cover both earrings and every accent stone, as seen on gemstone earring category pages such as JTV and Ross-Simons. A larger total weight can therefore mean more small stones rather than one larger center stone.

Millimeter dimensions are the more direct indicator of what you will actually see on your ear. When comparing two pairs, write down three figures if the seller publishes them: the center-stone dimensions per earring (for example, 6 mm round, or 6 × 8 mm oval); the total earring footprint, meaning overall length and width including any halo, cluster or drop length; and a weight breakdown that states whether a quoted carat figure is per stone, per pair of center stones, or all stones combined, including accents. If a listing shows only a total weight with no per-stone breakdown, ask for one before you order. For a related walkthrough of how earring measurements translate into on-ear appearance, see our emerald earrings buying guide.

Studs, drops, hoops and settings

Setting style changes both appearance and protection. Four-prong solitaire baskets keep the stone open to light; halo and cluster designs surround the center stone with accent stones and increase the overall footprint; drop designs add movement and length below the earlobe. GIA identifies earrings and pendants as especially suitable formats for tanzanite (GIA).

Closure is a separate specification that mainstream retailers list alongside metal and weight. Friction posts, screw backs, hinged posts, leverbacks and huggie clasps all behave differently during daily wear, and comfort is personal — no backing type is universally "safest" for every ear or every activity. If you prefer a low-profile post for sleeping or layering with other earrings, our guide to flat back earrings for adults explains how those closures differ.

Solid gold, vermeil or sterling silver?

"Gold" in an earring title can describe several different constructions, and the difference is regulated. US FTC guidance defines vermeil as sterling silver coated with gold of at least 10-karat fineness and at least 2.5 microns thick (16 CFR 23.4). Vermeil is therefore not solid gold, and a plated finish that does not meet those thresholds should not be called vermeil at all, regardless of how thick or durable a seller describes it as being.

Also check what changes when you switch a gold option on a product page: on some listings, selecting a solid-gold variant also changes the stones used, which is a specification change, not only a metal change. A karat number by itself tells you fineness, not hardness or scratch resistance; alloy composition and construction matter too, and no karat figure alone proves a piece will hold up to daily wear.

Certificates and authenticity: what a report can and cannot prove

A GIA colored-stone report can identify a stone as natural or synthetic, record detectable treatments, and describe weight, dimensions, shape, cutting style and color (GIA). GIA evaluates tanzanite but does not grade it (GIA), so a report will not assign a letter or star-based quality score.

A report also cannot tell you, by itself, whether a pair of earrings is well matched, what the setting metal is, or what a seller's return and warranty terms are — those are separate pieces of information you need to request directly.

When a product page states that an independent gemological certificate is included, treat that as a seller claim until you can see four specific things: the issuing laboratory's name, the report type, the report or reference number, and exactly which stone or stones the report covers. A pair of earrings might be documented by one report covering both stones, two separate reports, or a batch document covering a larger production run, and that distinction changes what you can verify later. Ask the seller these questions, and where possible, ask whether the report number can be checked against the issuing laboratory's own database, before you order.

What different kinds of evidence actually tell you

Not every piece of information on a product page carries the same weight. The table below summarizes, based only on the sources used for this guide, what each type of evidence can and cannot establish for a tanzanite earring listing. Use it to decide what additional proof to request before you buy.

Care

Tanzanite has a Mohs hardness of approximately 6–7 (GIA). Clean with warm, soapy water; avoid ultrasonic and steam cleaners (GIA). With protection from hard blows, tanzanite can be worn in all jewelry styles, and GIA identifies earrings and pendants as especially suitable formats (GIA). For anything beyond these points — storage, chemical exposure or servicing intervals — follow the written care instructions supplied with your exact piece rather than general gemstone advice.

Before-you-buy checklist

Use this checklist to evaluate any tanzanite earring listing before you add it to your cart:

1. Identity: mined (natural) tanzanite, a properly substantiated laboratory-created tanzanite, or a simulated/imitation stone — ask the seller to confirm which, and on what basis.
2. Treatment: heated, coated, fracture-filled or untreated.
3. Center stone dimensions: millimeters per earring.
4. Weight denominator: per stone, per pair, or all stones combined.
5. Accents: material, count and whether they change with the metal option selected.
6. Color and clarity description: a written description plus consistent-light video of the actual pair.
7. Setting and closure: prong, bezel, halo or cluster; post, screw, hinged or huggie.
8. Metal construction: solid karat gold, qualifying vermeil, or plated silver.
9. Documentation: laboratory name, report type, report number and which stones it covers.
10. Policies: production class (stock or made-to-order), return eligibility, warranty scope and exclusions.

FAQ

Is natural tanzanite usually heat-treated?

Yes. Most blue tanzanites on the market owe their color to heat treatment (GIA). Heat-treated tanzanite is still natural tanzanite; the treatment is stable.

Is simulated tanzanite the same as laboratory-created tanzanite?

No. Under FTC rules, a laboratory-created (synthetic) stone may use that name only if it has essentially the same optical, physical and chemical properties as the mined stone it names (16 CFR 23.25). A simulated or imitation stone is a different material that only resembles tanzanite in appearance, and the two terms are not interchangeable (FTC).

Is simulated tanzanite real tanzanite?

No. A non-mined, non-matching product must be clearly described with a qualifier such as "simulated" or "imitation" immediately before the gemstone name (16 CFR 23.25).

What does pair total carat weight mean?

It is a combined weight figure that can include both earrings and every accent stone. Always ask for the per-stone weight to understand the true size of the center gems.

Is tanzanite suitable for earrings?

Yes. GIA identifies earrings and pendants as especially suitable formats for tanzanite (GIA).

How should it be cleaned?

Clean with warm, soapy water; avoid ultrasonic and steam cleaners (GIA).

Does GIA grade tanzanite?

No. GIA evaluates tanzanite but does not grade it (GIA).

What does gold vermeil mean?

US FTC guidance defines vermeil as sterling silver coated with gold of at least 10-karat fineness and at least 2.5 microns thick (16 CFR 23.4).