Are cheap diamond earrings on Amazon real?

Quick answerUpdated October 17, 2026

What do cheap diamond earrings on Amazon actually buy?

We ran Amazon catalogue searches for diamond stud earrings on 17 October 2026 and sorted what came up by price band. Colour and clarity grades are the sellers’ own claims, and prices change daily, so check the live price on the listing. Sizes are per stone, for round stones.

The pattern: at this budget, lab-grown listings usually give one bigger stone per ear with better stated grades, while mined listings often reach their carat weight with many tiny stones at the bottom of the clarity scale. GIA describes inclusions at the Included grades (I1, I2 and I3) as obvious, and says they may affect transparency, brilliance and durability. The sizes come from the rule of thumb that a round brilliant’s diameter in millimetres is about 6.5 times the cube root of its weight in carats, which matches GIA’s figure that a 6.50 mm round brilliant diamond weighs about 1.00 carat. "14K gold plated" on a silver stud is a thin coat, not solid gold; see is gold jewellery on Amazon real.

Which words mean the earrings are not diamond?

Simulated and imitation: the US Federal Trade Commission tells sellers of look-alikes to tell shoppers they are not diamonds, with "imitation", "simulated" or a word of like meaning immediately before the word diamond. CZ, cubic zirconia or zirconia, and crystal. Moissanite: a different, cheaper gem that looks like diamond. Diamond alternative and substitute diamond. White sapphire or created white sapphire: sapphire, not diamond. Watch for titles that stack keywords. On 17 October 2026 we saw moissanite studs titled "Moissanite Lab Created Diamond Earrings", others that added "Lab Grown Diamond Earrings" after the word moissanite, and a stainless-steel set whose title read "Flat Back Diamond Stud Earrings" while its specifications gave the gem type as "Created Diamond" and, further down, the stone creation method as "Simulated". If any of these words appear anywhere in the title or specifications, treat the stone as not diamond, even when the word diamond appears too. The FTC also says a lab-grown diamond should be disclosed as not mined, with words such as laboratory-grown or laboratory-created immediately before the word diamond. Titles do not always do this: one gold vermeil pair whose title said only "Bezel Set Diamond Stud Earrings" gave its stone creation method as "Lab-Created" in the specifications, and the two other lab-grown pairs we looked at gave it as "Synthetic". For the full vocabulary, see lab-created vs simulated.

Is ctw the weight of the pair or of each earring?

The pair. Ctw (or cttw) is carat total weight. GIA uses total carat weight for the combined weight of all the diamonds in a multi-stone ring, and earring listings use it the same way for both earrings together: one 1/5 ctw listing spelled it out as 0.2 cttw, 0.1 ct each. So 1/4 ctw studs are two stones of about 1/8 carat, roughly 3.2 mm each, not two quarter-carat stones of about 4.1 mm. Three more checks: Number of stones. A total can be spread over clusters; one mined 1/4 ctw pair described 16 stones. Many small stones cost less than one stone of the same total weight: GIA notes that a ring with a single 1.50 ct diamond costs significantly more than one whose diamonds total 1.50 carats. Pair or single. Some listings sell one earring ("single stud", "1 pc only"). Fractions are approximate. The FTC says a fraction may represent a range of weights (its example: a diamond described as 1/2 carat could weigh between 0.45 and 0.54 carat), and that sellers should say conspicuously that the weight is not exact and give the range or tolerance. Our carat size chart shows how millimetres grow with weight.

Can a home diamond tester tell lab-grown from mined?

No. GIA says lab-grown (synthetic) diamonds are real diamonds with the same properties as natural ones, that you cannot spot one by looking through a loupe, and that the only way to tell is laboratory testing. A heat-based (thermal) diamond tester reads lab-grown and mined diamond alike, and GIA reported in 1997 that thermal testers react to moissanite as if it were diamond too (here is why), so a pass proves less than it seems. Small stones are harder still: GIA’s 2024 update in Gems & Gemology says there is no cost-effective or rapid screening tool that can definitively identify all laboratory-grown diamonds, and that a tiny melee stone can take two to three times longer to analyse than a half-carat diamond. None of the mined studs under $250 in our searches named an IGI or GIA report in its title, so "natural" on a pair of tiny stones rests on the seller’s word, and one 1/2 ctw pair in 14K gold gave its stone creation method as "Unknown". If origin matters to you, buy stones with an IGI or GIA report and check the number yourself. What a home check can do is catch moissanite: look at the stone at an angle through a side facet with a 10x loupe, and moissanite’s back facet edges look doubled, while diamond, which is singly refractive, never shows this. Looking straight down through the top facet may show no doubling, because moissanite is usually cut to hide it in that direction.

What else could the same money buy?

Bigger lab-grown diamonds. If you want real diamond, lab-grown gives one stone per ear, larger and with better stated grades than mined at the same price, as the table shows. Our lab diamond earrings guide covers settings, backs and reports. Moissanite studs of 1 carat total. In the same searches, moissanite studs of 1 to 2 carats total (about 5 to 6.5 mm per stone, since moissanite is usually sold by diamond-equivalent weight, the weight of a diamond that size) were in sterling silver under $50, a much bigger look than 1/10 ctw of diamond. See moissanite vs lab diamond and moissanite gifts under $50 and $100. Lab-created white sapphire studs. Created white sapphire studs of 5 to 6 mm in sterling silver sat in the same under-$50 band. Lab-created sapphire is the same mineral as mined sapphire (why), though it is not diamond and should not be sold as one.

Sources

• US FTC: The Loupe, advertising diamonds, gemstones and pearls (simulated and imitation, lab-grown disclosure, fractional weights)
• GIA 4Cs: Nine things about diamond carat weight you need to know (total carat weight; one 1.50 ct diamond against several totalling 1.50 ct)
• GIA 4Cs: Diamond clarity (the Included grades I1, I2 and I3)
• GIA 4Cs: How to tell if a diamond is real (lab-grown needs laboratory testing)
• GIA, Gems & Gemology (Summer 2024): Laboratory-grown diamonds, an update on identification and products evaluated at GIA (Eaton-Magaña, Hardman and Odake)
• GIA, Gems & Gemology (Winter 1997): Synthetic moissanite, a new diamond substitute (Nassau, McClure, Elen and Shigley), full article PDF (thermal probes read it as diamond; doubled facet junctions; a 6.50 mm round brilliant diamond weighs about 1.00 ct)
• GIA: Synthetic gems (lab-made, with virtually the same chemical, optical and physical characteristics as the natural mineral)
• Wikipedia: Diamond (gemstone) (round brilliant diameter about 6.5 mm times the cube root of carat weight)

Keep reading

Amazon links are affiliate links (tag thegemtray-20): buying through them costs you nothing extra and supports the site. As an Amazon Associate we earn from qualifying purchases.