If you are researching a moissanite engagement ring, you have probably met two kinds of writing: breathless marketing that calls moissanite "just like a diamond," and diamond-industry content that dismisses it outright. Neither is honest. This guide sets out what moissanite actually is, how it performs on the hand over years, what it should cost, and — because it matters — when it is the wrong choice.
What is moissanite, exactly?
Moissanite is a real gemstone: crystalline silicon carbide. Natural moissanite is so rare that virtually every stone sold today is lab-created, grown under controlled conditions and then faceted like any other gem. It is not a diamond, and a trustworthy jeweler will never tell you it is. It is its own material, with its own optics — some of which measurably exceed a diamond's.
How does moissanite compare with a diamond?
Three numbers tell most of the story.
- Fire (dispersion): 0.104 versus 0.044. Dispersion measures how a stone splits white light into flashes of colour. Moissanite's 0.104 is more than double a diamond's 0.044, which is why it throws noticeably more rainbow fire — a trait some people love and others find too loud (more on that below).
- Brilliance (refractive index): 2.65–2.69. Moissanite bends light more aggressively than diamond does, so a well-cut stone reads bright even in dim rooms — candlelight suits it.
- Hardness: 9.25 on the Mohs scale. Diamond defines the top of the scale at 10; moissanite sits just below it, above sapphire and ruby. In practice it resists the scratches of daily wear better than any gemstone that is not a diamond.
Quality moissanite is also typically graded in the D–F colourless range with VVS1 clarity — grades that, in a diamond, would command extreme prices.
Does moissanite last? Does it get cloudy?
Moissanite does not fade, yellow, or cloud with time. The clouding people fear comes from cubic zirconia, a much softer material that abrades and dulls within a few years of daily wear. Silicon carbide is chemically stable and hard enough that, with ordinary care — warm water, mild soap, a soft brush — a moissanite engagement ring will look in twenty years the way it looks today. It is genuinely suitable for everyday wear, including on hands that work.
What should a moissanite engagement ring cost?
Far less than a comparable diamond. Because moissanite is grown rather than mined, its cost does not climb exponentially with carat size the way diamond prices do. What you are actually paying for is cutting quality, the setting metal, and the maker's margin. A well-made moissanite engagement ring set in 925 sterling silver commonly sits in the low hundreds of dollars; solid gold or platinum settings raise the price — the metal does, not the stone. Be wary of anyone charging near-diamond prices for moissanite. The material does not justify it.
The honest downsides
- No meaningful resale value. Diamonds resell poorly; moissanite resells worse. Buy it to wear, not as a store of value.
- The fire can read as "too much." That 0.104 dispersion means large stones in brilliant cuts flash strong rainbow colour under bright light. Some wearers adore the effect; others want a whiter, quieter sparkle.
- It will not fool a gemologist. Because of its thermal properties, moissanite often registers as diamond on basic pen testers, but a combination tester identifies it immediately. If you need a stone that passes as a diamond in every sense, moissanite is the wrong purchase — and the wrong reason to buy one.
When is moissanite the wrong choice?
Honesty cuts both ways. Skip moissanite if:
- you or your partner specifically want a diamond — the meaning of the object can matter more than its optics;
- you are buying partly as an heirloom asset you expect to hold monetary value;
- you dislike strong rainbow fire and are not willing to choose cut and size to temper it.
For everyone else — buyers who want a bright, durable, honestly priced stone and would rather put the diamond difference toward the life the ring is celebrating — moissanite is an excellent choice, made with clear eyes.
How to choose a stone that reads the way you want
Fire scales with size and cut. For maximum sparkle, choose a round or cushion brilliant at a full carat or more. For a stone that reads closer to a classic white gem, go smaller — modest stones show noticeably less rainbow fire — or choose a step cut: emerald and Asscher cuts trade fire for long, elegant flashes of white light. Ovals and pears sit between the two and lengthen the hand. Colour is simple: D–F stones are colourless to the eye, so there is little reason to accept less.
A word on sterling silver settings
Our settings are 925 sterling silver, and we will only ever call them that — never gold, never vermeil. The finish is platinum over the solid silver, and we describe it as exactly that: a plating on top of 925, not a metal in its own right. Silver is softer than gold or platinum, so it will pick up fine surface marks with wear and rewards an occasional polish. In exchange, it keeps a genuinely fine stone within reach, and its cool, moonlit colour suits the darker aesthetic this house is built on.
If that aesthetic speaks to you, the Maison Noctaura collection pairs lab-created moissanite with 925 sterling silver, platinum-finished, with every material named plainly on the page.
Four rings, with their numbers
The Corona Ring is a single round brilliant, near-colourless and eye-clean. The Aureole Halo Ring sets a 0.5 ct centre in a double halo, 9.5 mm across the top. The Laurel Coronet Ring sets a 1.2 ct vintage cut in an ornate halo, 17 mm across. The Eclipse Eternity Band is the 5.4 mm line of eye-clean stones to wear beside any of them. All four are solid 925 sterling silver, and every measurement here is on the piece’s own page.
