Does Moissanite Pass a Diamond Tester?
Yes — moissanite passes most standard diamond testers. Traditional testers measure how well a stone conducts heat, and moissanite conducts heat almost exactly like a diamond, so it reads as “diamond.” Newer dual testers that also check electrical conductivity can tell the two apart. Every MILSOVAULT moissanite piece is diamond-tester positive.
How a diamond tester works
Most common, inexpensive diamond testers are thermal testers. They send a tiny pulse of heat into the stone and measure how quickly that heat moves through it. Diamonds conduct heat extremely well, so the tester lights up “diamond” when heat passes through fast enough.
Why moissanite passes
Moissanite is a lab-created gemstone made of silicon carbide. It happens to conduct heat almost as well as a diamond does. Because a thermal tester only measures heat conductivity, it cannot tell the difference — so moissanite reads as “diamond” on these testers. This is exactly why iced-out moissanite jewelry looks and tests so convincingly.
How modern testers tell moissanite and diamond apart
Because moissanite fooled older thermal testers, newer “dual” testers were made that also measure electrical conductivity. Moissanite conducts electricity while diamond generally does not, so a moissanite/diamond dual tester can correctly separate the two. A jeweller can also tell them apart under magnification, since moissanite shows a slight double-refraction (doubling of the facet edges).
So is moissanite “fake”?
No. Moissanite is a real, distinct gemstone — not a “fake diamond.” It is prized in its own right for its exceptional brilliance and fire, and for being very hard and durable (about 9.25 on the Mohs scale, just below diamond at 10). It simply offers the diamond look at a far more accessible price.
MILSOVAULT moissanite
Every MILSOVAULT piece is set with hand-placed VVS-clarity moissanite on 925 sterling silver with a bright platinum finish, and is diamond-tester positive. If you'd like to know more about a specific piece, or want something custom, message us on WhatsApp.
Frequently Asked Questions
Will moissanite pass a diamond tester?
Yes. Standard thermal diamond testers read moissanite as “diamond” because moissanite conducts heat almost as well as a diamond does.
Can a jeweller tell moissanite from a diamond?
Yes. A dual (moissanite/diamond) tester that measures electrical conductivity, or simple magnification to spot moissanite's double refraction, will distinguish the two.
Is moissanite a real diamond?
No. Moissanite is a separate lab-created gemstone (silicon carbide), not a diamond. It's valued for its own brilliance, fire and durability.