What Actually Drives Moissanite Price
Moissanite pricing looks arbitrary until you know which variables carry weight and which are decoration. Two stones the same size can differ by 30 per cent for reasons that are entirely mechanical, and two rings the same size can differ by 400 per cent for reasons that have nothing to do with the stone.
The five drivers, in order
On a loose stone, the order of influence runs: size, then shape, then cut and colour, then certificate — with certificate a long way behind the rest.
On a complete ring, metal moves to the front. A stock silver ring and a stock 18K gold ring with an identical stone can differ by three to five times in price, which no stone variable can match.
Getting this order right matters because buyers routinely pay attention in the reverse order. They agonise over certificate wording, which is nearly free, and accept whatever metal is offered, which is the largest line on the invoice.
Size: why it is not linear
Price rises faster than diameter. A stone twice the diameter is four times the volume, and the rough required grows faster still because larger clean crystals are rarer in the growth batch and yield falls as size increases.
The practical consequence is that the step from 6.5mm to 8mm — about 23 per cent wider — roughly triples the stone cost, while the step from 5mm to 6mm adds around 40 per cent. Most of the perceived value sits in the last millimetre, which is exactly where the price is steepest.
One number worth knowing: moissanite is sold in diamond-equivalent carats. A 6.5mm round is called 1 ct because that is the diameter of a 1 ct diamond, but it actually weighs about 0.88 ct, since moissanite's density is 3.21 against diamond's 3.52. You are buying millimetres. The carat label is a translation, and a loose one.
What carries the weight
A rough breakdown for a complete ring in the middle of the market. The percentages move with the metal, which is the point.
| Driver | Share, silver ring | Share, gold ring | Moves with |
| Stone size | 30–40% | 10–20% | Diameter, cubically |
| Metal | 25–35% | 55–70% | Alloy and gram weight |
| Stone shape | 10–20% | 5–10% | Cutting loss, rough clarity needed |
| Cut and colour grade | 10–15% | 5–8% | Symmetry, polish, tint |
| Certificate | 2–4% | 1–2% | Card, printing, grading time |
Shape: the hidden variable
All shapes are not cut with the same efficiency. A round brilliant is the most efficient cut in existence: it is designed to return light through the top, and it wastes the least rough per carat. That is why rounds are the cheapest shape per carat in every material, and why every other shape carries a premium.
Fancy shapes lose more rough. An oval, pear or marquise has to be cut from a block that can accommodate its length, and any flaw near a point kills the whole stone. Step cuts — emerald and asscher — are the strictest: their wide, flat facets hide nothing, so a clarity grade that a brilliant would disguise becomes visible. That demands cleaner rough, and cleaner rough costs more.
The result is that a 1 ct emerald cut can cost 25 to 40 per cent more than a 1 ct round of the same colour, not because it is rarer in the way a collector means, but because the factory threw away more material to make it.
The same weight, different millimetres
Because the carat label is a diamond-equivalent translation, equal-weight stones in different shapes have very different dimensions — and dimensions are what you actually see on the finger.
| Shape | 1 ct equivalent | Relative stone cost |
| Round | 6.5mm | Baseline |
| Cushion | 6.2 × 6.2mm | +10–20% |
| Oval | 7.7 × 5.7mm | +15–25% |
| Princess | 5.5 × 5.5mm | +15–25% |
| Pear | 8.5 × 5.5mm | +20–30% |
| Marquise | 10.0 × 5.0mm | +20–35% |
| Emerald / asscher | 7.0 × 5.0mm | +25–40% |
Cut quality: what the money buys
Cut is the only driver that changes what the stone looks like from across a table. Two 7mm round moissanites of the same colour and clarity can look markedly different — one bright and crisp across its whole face, one with a dull ring near the edge where the pavilion angles are slightly off.
What to look at: whether the stone goes dark in the centre at arm's length, whether the facets are symmetrical around the table, and whether the girdle is even all the way round. Those three checks do more than any grade printed on a card.
Colour is the second-order variable. Moissanite has a slight natural tint, and D-colour is the top of the range — genuinely colourless rather than near-colourless. The premium for D over G is real and modest. It becomes worth paying when the stone sits beside white diamonds; it matters much less in a solitaire with nothing to compare against.
Metal: the largest swing
Metal is where most of the price of a complete ring actually lives, and where the least attention is paid. In ascending order of cost for the same ring: 925 sterling silver, then 9K gold, 14K, 18K, then PT950 platinum.
The step between them is not proportional. Platinum is not merely more expensive per gram — it is denser, at roughly 20.7 g/cm³ against 18K gold's 15.5 and silver's 10.4, so the same ring uses about a third more platinum by weight before the per-gram price is applied at all.
Two things follow. A silver version of a ring is not a cheaper version of the gold one; it is a different object with a different lifespan, and it should be priced and judged that way. And if a stone is genuinely expensive, the metal around it should not be the thing that fails first — 18K white gold prongs wear faster than platinum ones on a ring worn daily.
Certificate: the smallest line
A GRA card accompanies moissanite and costs the maker very little: it is issued with the stone, printed and matched to its measurements. It is not a per-stone laboratory report in the sense that an IGI report on a lab-grown diamond is, where the stone is individually graded, and that grading carries a real per-stone cost.
That difference matters less than the internet suggests. Both documents tell you the same three useful things — measurements, colour grade, clarity grade — and neither makes a stone look better in daylight. Pay for the stone, not for the paperwork.
Premiums not worth paying
Hearts-and-arrows claims without images. The pattern is real and verifiable by photograph. If there is no photograph of the actual stone type, the claim is marketing.
Exotic grading on moissanite. Reports from diamond-grading labs that do not grade moissanite are a contradiction. If a listing cites one, ask what was actually graded.
Plating language. Rhodium on white gold is normal maintenance, not an upgrade; "platinum plated" silver is a finish measured in microns and will wear off.
Coated colour. Coloured coatings on moissanite can be beautiful and can also wear at the girdle within a year or two. Uncoated body colour is the durable choice.
Named cut styles at a premium. Every moissanite is a brilliant or a step cut of some kind. A proprietary name usually describes a standard cut with a markup.
Premiums worth paying
Better cut. Visible in daylight, permanent, and the single best use of money on a stone.
D colour, if it sits beside diamonds. Degree of tint becomes obvious in comparison and invisible in isolation.
Thicker prongs and a heavier shank. Unglamorous, rarely photographed, and the reason a ring survives twenty years instead of eight.
The metal upgrade, if the ring is worn daily. A $40 difference in alloy buys years of wear before a rebuild.
What we make
We make rings in our own factory in Guangxi, which we have operated since 2008, in 925 sterling silver, 9K, 14K and 18K gold, and PT950 platinum. Stones are GRA-certified D-colour VVS1 moissanite or IGI-certified lab-grown diamonds, cut in the shapes listed above and priced by millimetre rather than by label. Prices run from $17 to $2,020, with a typical piece around $98 — the low end is silver with a smaller stone, the top end is 18K or platinum with a large one.
Free shipping over $99, $5.99 below. Returns accepted for 30 days on unworn pieces in original packaging. If you are weighing two options, send us the diameter in millimetres and the metal you want and we will tell you where the money is actually going in each, rather than quoting a grade and leaving you to guess. Custom and engraved pieces are made to order and cannot be returned.
