The moissanite in rings and earrings is grown in a lab, not dug out of the ground. Natural moissanite does exist, but it is so rare and so tiny that none of it ends up in jewelry. Its story starts in space, at an Arizona crater left by a meteorite, where it was first mistaken for diamond.1Wikipedia. Moissanite That makes a lab-made moissanite a real gemstone in its own right, a copy of a rare natural mineral rather than glass pretending to be diamond.
How Moissanite Was Discovered in a Meteor Crater
In 1893, French chemist Henri Moissan examined rock from what is now Meteor Crater near Canyon Diablo, Arizona.2Wikipedia. Moissanite He spotted sparkling crystals in it and at first believed they were diamonds.3Wikipedia. Moissanite By 1904 he had identified them as silicon carbide, a hard compound of silicon and carbon.4Wikipedia. Moissanite The mineral was named moissanite after him.5Lithos. Moissanite SiC with metal-silicide and silicon inclusions from tuff of Israel Raman spectroscopy and electron microscope studies
The mix-up is easy to understand: both materials are extremely hard and sparkle intensely, and in 1893 the tools for telling crystal types apart were limited. Moissan could break the crystals down chemically and find silicon and carbon rather than carbon alone, and that is what separated them from diamond.
The rock came from the area around a huge bowl-shaped crater in northern Arizona, formed thousands of years ago when a metal-rich meteorite struck the ground. No one mines moissanite there.
Tiny grains of silicon carbide also turn up inside meteorites themselves.6Meteoritics. The origin of circumstellar silicon carbide grains found in meteorites They formed around carbon-rich stars long before our solar system existed, so some natural moissanite is literally stardust older than the Sun. These grains are microscopic, far too small to see or cut.
Sellers sometimes say moissanite “comes from the stars,” which is true only of the original mineral. Your stone was grown in a factory.
Why Natural Moissanite Is Too Rare for Jewelry
Silicon carbide survives only where there is almost no free oxygen.7PubMed. Immiscible metallic melts in the deep Earth: clues from moissanite (SiC) in volcanic rocks Where oxygen is plentiful, silicon and carbon tend to combine with it and form ordinary minerals such as quartz and carbonates instead. Most of Earth’s mantle and its melted rock hold far more oxygen than moissanite can tolerate.8PubMed. Immiscible metallic melts in the deep Earth: clues from moissanite (SiC) in volcanic rocks So it forms only in unusual spots, such as where gases like hydrogen and methane strip oxygen from melts or fluids deep underground.9PubMed. Immiscible metallic melts in the deep Earth: clues from moissanite (SiC) in volcanic rocks Some forms at relatively low temperatures, below about 700–800°C, in tiny pockets between mineral grains.10Progress in Earth and Planetary Science. Natural moissanite (SiC) – a low temperature mineral formed from highly fractionated ultra-reducing COH-fluids Those pockets are small and scattered, so moissanite grows as isolated specks rather than large crystals, and even a rock that contains it typically holds just a few. Natural grains have been reported in some volcanic rocks.11Lithos. Moissanite SiC with metal-silicide and silicon inclusions from tuff of Israel Raman spectroscopy and electron microscope studies
Finding it is hard even where it exists. Researchers usually discover grains by dissolving or crushing rock samples and examining the residue under a microscope, not by spotting them in the field. Some finds have been questioned because silicon carbide is also used industrially in saw blades and abrasives, so contamination from lab or drilling equipment has to be ruled out. Scientists look for grains sealed inside other minerals, where tools could not have introduced them, before accepting that a grain is natural.
Diamond also forms deep down, but in crystals large enough to mine. Moissanite never collects in mineable deposits, which is why lab growth was the only way to get it into jewelry. Any faceted moissanite offered for sale is lab-grown, whatever a label hints, and a listing claiming a mined, gem-size moissanite should raise suspicion.
How Lab-Grown Moissanite Is Made
Silicon carbide has been mass-produced for over a century by heating sand and petroleum coke in an electric furnace.12Steel Research. Study of formation of silicon carbide in the Acheson process It is valued as an abrasive and, more recently, in high-power electronics.13Japanese Journal of Applied Physics. Technological Breakthroughs in Growth Control of Silicon Carbide for High Power Electronic Devices But the furnace product is gritty and dark, not gem quality. It comes out as masses of tiny crystals fused together, full of flaws, which works for sandpaper and grinding wheels but not for a ring. A gem needs one continuous crystal, because boundaries between grains scatter light and make a stone look cloudy.
Colorless, eye-clean crystals became possible only in the 1990s at Cree Research in North Carolina.14Current Science. Synthetic moissanite: A new man-made jewel A patented method grew the crystal on a seed crystal of one chosen structure.15Current Science. Synthetic moissanite: A new man-made jewel The seed is a small slice of silicon carbide crystal in a chamber, and vapor from heated source material settles on it. Atoms line up with the seed’s pattern, so the seed’s structure is copied as the crystal grows.16Journal of Crystal Growth. SILICON CARBIDE GEMS Growth happens at very high temperatures and is slow, which is part of why it took careful engineering. The crystal is then sliced into pieces sized for individual stones, faceted and polished like a diamond, then graded and set.
Color was the hard part. Tiny impurities tint silicon carbide yellow, green or gray, and one crystal form is naturally deep yellow and useless as a diamond look-alike. Another patented technique balances out impurities to keep the stone near-colorless.17Current Science. Synthetic moissanite: A new man-made jewel Some cheaper or older stones still show a faint tint. Charles & Colvard, formerly C3 Inc., developed and marketed the gem version.18Current Science. Synthetic moissanite: A new man-made jewel
Cutting has improved too. Later stones showed better polish and sharper facet edges than early ones,19Gems & Gemology. Synthetic Moissanite: A New Diamond Substitute so today’s moissanite is generally better finished than the first stones sold in the late 1990s.
Is Moissanite a Fake Diamond
Lab moissanite has the same makeup as natural moissanite, so it is a synthetic version of a real mineral. In gem language, synthetic does not mean fake; it means the stone has the same chemistry and structure as a natural one but was made by people. It is not diamond, though, so when sold in place of diamond it is a diamond substitute.20Current Science. Synthetic moissanite: A new man-made jewel
Of all diamond look-alikes, its overall properties come closest to diamond’s.21Current Science. Synthetic moissanite: A new man-made jewel That places it between cheap imitations like cubic zirconia and real diamond. Both moissanite and cubic zirconia are lab-made, but cubic zirconia is softer, and it scratches and clouds over years. Moissanite keeps its polish far longer. Look for “lab-created moissanite” or “synthetic moissanite.” Phrases like “diamond simulant” mean it is not diamond, and sellers who describe moissanite as a kind of diamond are best avoided.
Moissanite rates 9.25 on the 10-point hardness scale, just below diamond’s 10.22Geologija. Moissanite – Black Diamond – Challenges for Gemologists in the Third Millennium? That resists scratches well enough for an everyday ring, since it is harder than nearly everything a wearer will touch, including the gritty dust that dulls softer gems. Hardness is not the same as toughness, though, and a hard knock along an edge can still chip it. A protective setting, and taking the ring off for rough work, keeps it looking new for years.
How Moissanite Looks Different From Diamond
Moissanite bends light more than diamond does, and it splits white light into colors more than twice as strongly.23Current Science. Synthetic moissanite: A new man-made jewel The result is noticeably more rainbow flashes, especially in sunlight. Strong direct light gives the stone more to split. Under soft indoor lighting the difference can be much smaller than in a sunny window. Try a stone in different lighting.
Moissanite also has double refraction, splitting each ray of light into two, while diamond has none.24Current Science. Synthetic moissanite: A new man-made jewel As a result, back facet edges can look slightly doubled when viewed through the top.25MollyJewelryUS. About Moissanite This is usually visible only with a 10x jeweler’s loupe.26MollyJewelryUS. About Moissanite Cut direction affects how noticeable it is, and a well-cut stone shows less doubling than a poorly oriented one.
Moissanite is lighter than diamond, 3.22 versus 3.52 on the density scale.27Current Science. Synthetic moissanite: A new man-made jewel A moissanite the same size as a diamond therefore weighs a bit less. Because it is often sold by size equivalent to diamond, compare stones by millimeter size, not just carats.
At arm’s length most people cannot tell the two apart. Viewing both side by side in sunlight before buying helps.
Why Moissanite Costs Less Than Diamond
A 1-carat moissanite usually costs about $300 to $600, with some sellers going up to $800.28GOODSTONE. Moissanite vs. Lab Diamond: Understanding the Differences, Pros, and Cons A 1-carat lab-grown diamond, real diamond made in a lab, costs roughly $800 to $5,000 depending on quality.29Awareness Avenue Jewelry LLC. Moissanite vs Lab Diamond Price: The 2026 Breakdown A near-colorless 1-carat mined diamond runs around $5,500.30GOODSTONE. Moissanite vs. Lab Diamond: Understanding the Differences, Pros, and Cons
The gap comes from supply. Moissanite is produced at scale specifically as an alternative and priced like one.31Stienhardt. Moissanite vs Lab Grown Diamond: The Honest Comparison It is grown in factories on a repeatable schedule, so supply can rise to meet demand, while mined diamonds depend on deposits that are costly to find and extract. Diamond pricing also reflects decades of marketing and a grading system built around scarcity.
The same budget buys a larger moissanite than lab diamond,32GOODSTONE. Moissanite vs. Lab Diamond: Understanding the Differences, Pros, and Cons or a more elaborate setting, or a better metal and craftsmanship. Lab-grown diamond sits in between and spans a wide range, since quality grades push the price far up or down.
Choosing between the two comes down to what you value. Lab diamond is actual diamond and can be graded as one. Moissanite saves most of the budget but is a different stone. Ask which matters more, the word “diamond” or size and sparkle per dollar, and compare certified quality, since prices vary by seller.
How Jewelers Tell Moissanite From Diamond
Moissanite carries heat almost like diamond.33Geologija. Moissanite – Black Diamond – Challenges for Gemologists in the Third Millennium? Basic testers send a small amount of heat into the stone and measure how fast it spreads, and diamond is unusually good at carrying it. Moissanite produces nearly the same response, so every moissanite tested on standard heat-based diamond testers read as diamond.34Gems & Gemology. Synthetic Moissanite: A New Diamond Substitute A pass on a basic diamond pen therefore does not prove a stone is diamond.
Other methods work. Doubled facet edges under a loupe reveal moissanite.35MollyJewelryUS. About Moissanite Moissanite also responds to polarized light very differently from diamond and cubic zirconia.36Scientific Reports. Polarization imaging for gemstone identification and metrology Many testers designed for moissanite check electrical conductivity, which differs between the two, and a tester that reports both diamond and moissanite lets a jeweler separate them without relying on heat alone. The test takes seconds and does not harm the stone. Ask a jeweler to use a combined diamond/moissanite tester or a loupe check.
If you are buying or inheriting a stone, request a lab report for any stone sold as diamond, and ask how it was tested, not just whether it passed. Older pieces tested before gem moissanite reached the market may deserve retesting. Reputable sellers disclose moissanite up front.