How to Choose a Moissanite Seller

Moissanite 101

Every seller claims D–E–F colour and VVS clarity. None of those claims are comparable, because no laboratory grades moissanite. Here is what to judge instead.

Written by the Mapple Gems workshop, Surat · Updated 1 October 2026

Short answer

No laboratory issues colour, clarity or cut grades for moissanite, so a seller's D–E–F or VVS claim is an in-house assessment rather than a comparable grade. Judge a moissanite seller on what can actually be checked: stone measurements in millimetres, gram weight, shank thickness, the material of every accent stone, a rotating video under ordinary light, and whether they will put the specification in writing.

Choosing a moissanite seller feels harder than choosing a diamond seller, and it is — but not for the reason most people assume. The problem is not that moissanite is risky. It is that the usual comparison tools do not work, and most buyers keep trying to use them anyway.

Start from the fact that changes everything

Diamonds, mined or lab grown, are graded by independent laboratories against published scales. Moissanite is not. There is no laboratory issuing colour, clarity or cut grades for it, which has three consequences:

Grade claims are not comparable. One seller's D–E–F is another's near-colourless. Both may be sincere. Neither is a measurement.
There is no upper price anchor. With no grading tier to price against, a high price is not evidence of a better stone. Moissanite is the one gem category where paying more guarantees nothing at all.
You are the cut grader. Nobody has assessed the proportions. That work falls to you, on video.

This sounds discouraging. It is actually clarifying, because it moves the entire question off the stone's paperwork and onto the seller's process — which is far easier to check.

Six things you can ask that cannot be faked

Millimetres, not carats. Moissanite is roughly 15% less dense than diamond, so it is sold by diamond equivalent weight — a stone described as one carat measures about 6.5 mm and genuinely weighs closer to 0.88 ct. Only millimetres compare between sellers. A stone measuring larger than standard for its stated equivalent weight is a shallow-cut warning, not a bonus.
Gram weight of the finished metal, at your ring size. Gold trades on a public daily market, so this is the one component of the price anyone can verify.
Shank thickness at the base in millimetres. Below about 1.8 mm a daily-wear ring is on a countdown, and this is where a cheap build hides.
What material is every stone. Mixed builds — one material in the centre, another in the accents — are common across the whole trade and perfectly rational, since accents under about 0.2 ct are never individually certified in any material. The issue is never the build; it is non-disclosure. Ask for it in writing.
A rotating video under ordinary indoor light. Not a lightbox, which flatters every stone equally. You are looking for a dull zone that stays in the same place as the stone turns — that is a cut fault, not lighting.
A photograph of a piece part-finished — cast but not yet set. No reseller can produce one at any price, because nobody photographs a half-made ring for a catalogue.

Translating the claims

What the listing says	What it actually means	Ask instead
“D–E–F colour, VVS clarity”	An in-house assessment; no lab issued it	A rotating video in ordinary light
“1 carat moissanite”	Diamond equivalent weight, not true weight	The measurement in millimetres
“Hearts and arrows”	A claim, not a certification, in moissanite	Video of facet junctions under rotation
“Conflict-free moissanite”	Meaningless — it is grown, not mined; usually a tell of copied template text	Where the gold comes from, which is the real question
“Gold over / filled / plated / vermeil”	Not solid metal. If “gold” needs a preposition, it is layered	Karat and fineness number, and gram weight
“Handcrafted, heirloom quality”	Undefined terms with no agreed meaning	Who does the setting, and where

Reading a refusal

You will sometimes be told no, and the kind of no matters more than the fact of it. There are three:

Protecting the piece. “We won't set that stone in four prongs at this size, because the girdle is thin — here is what we'd do instead.” A reason and an alternative. That is expertise, and it is a good sign.
Protecting the workshop. “We won't work on a stone we didn't supply.” Reasonable. Go elsewhere for that job.
Avoiding the question. No gram weight, no shank thickness, no millimetres, no accent count. This is the only one worth walking away from — it means either the seller did not make the piece, or would rather you could not compare it.

The sorting question is simply: is that a can't, or a won't? A “can't” that becomes a “can” when you offer more money was never a physical constraint.

What a good seller asks you

Everyone publishes questions to ask a jeweller. Listening to what you are asked is quicker and much harder to fake. A workshop that designs rather than resells will want to know what the wearer does with their hands, whether they wear jewellery at all, the ring size and how it was measured, whether there is a fixed date, the budget, and whether a wedding band is coming later. A seller who asks none of these is taking an order, not designing a ring.

An honest concession

We sell moissanite, and we will not hand you a colour grade to weigh against another seller's, because there is nothing behind either number to weigh. What we can give you is the millimetre measurement, the parcel specification for the accent stones, the shank dimensions as built, and video of the actual piece — and if you ask us to put all of that in writing before you pay, that is the correct instinct and we would rather you did. Apply the same standard to us that this article asks you to apply to everyone else.

The checklist

Ask for the stone in millimetres, and check it against a standard size chart for that shape.
Ask for gram weight at your size, and shank thickness at the base.
Ask what material every stone in the piece is, and get it in writing.
Ask for rotating video under ordinary indoor light, not a lightbox.
Watch for a dull zone that stays put as the stone turns — a cut fault — rather than one that moves, which is lighting.
Reverse-image-search the product photograph.
Ask for a part-finished photograph.
Notice what you are asked in return.

Keep reading

Questions people ask

Is moissanite graded by a laboratory?

No. No laboratory issues colour, clarity or cut grades for moissanite. Any D–E–F or VVS claim on a listing is the seller's own assessment, which means such claims cannot be compared between sellers.

How do I know if a moissanite seller is trustworthy?

Judge them on answerable questions rather than on claims. Ask for stone millimetres, gram weight, shank thickness, the material of every stone, rotating video under ordinary light, and a part-finished photograph. A seller who supplies those made the piece; one who avoids them probably did not.

Does a more expensive moissanite mean a better stone?

Not reliably. Because there is no independent grading and therefore no upper price anchor, price is a weak signal in moissanite specifically. Cut quality, which you assess yourself on video, matters far more than the figure on the page.

Why do sellers list moissanite in carats if it is not weighed that way?

Because buyers think in carats. Moissanite is about 15% less dense than diamond, so the trade quotes diamond equivalent weight: a “1 ct” stone measures around 6.5 mm and truly weighs nearer 0.88 ct. Compare millimetres, never carat figures.

Should I worry if the accent stones are a different material from the centre?

Not in itself — mixed builds are common and sensible, because accents sit at one to two millimetres where no material is visually distinguishable, and melee under about 0.2 ct is never individually certified anyway. What matters is that the seller discloses it in writing rather than naming only the centre stone.

Ask us the hard questions

We make what we sell in our own workshop in Surat. Millimetres, grams and specifications on request.

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