Questions

No — moissanite is its own gemstone, lab-created silicon carbide, with more fire than a diamond (dispersion 0.104 versus 0.044) and a hardness of Mohs 9.25. It is graded to the maker’s standard rather than independently certified, and it costs a fraction of a mined diamond. Every Noctaura stone is described as moissanite. The full comparison is in our guide, Is Moissanite a Real Diamond?

On a basic thermal tester, yes — moissanite conducts heat much the way a diamond does, so pen testers often read it as diamond. A dual moissanite/diamond tester tells them apart. We mention this only so you are never surprised: we always describe the stone as moissanite. The tests that do and do not work at home are in our guide, How to Tell Moissanite from a Diamond at Home.

Every Noctaura piece is solid 925 sterling silver — 92.5% pure silver all the way through, not plated over brass and not gold-filled. It is a genuine precious metal, soft enough to be worked finely and hard enough to wear daily. No Noctaura piece is gold or vermeil. We go further on the metal in our guide, Is Sterling Silver Good for a Moissanite Ring?

It can, slowly, with exposure to air and skin — that is the metal living, not a fault. A soft polishing cloth brings it back to bright in seconds, and storing pieces dry and sealed slows it right down. See our care guide for the full routine, or our journal guide, How to Care for Moissanite and Sterling Silver Jewelry.

Use the ring-size converter in our Sizing Studio: measure the inside circumference of a ring you already own, or wrap a strip of paper around your finger and measure it in millimetres, and the tool gives you your US size instantly.

Shipping is $8.99 worldwide and fully tracked, and free on any order over $150 (judged on your total after any discount) — the threshold is on your cart total, so two smaller pieces can cross it together. Delivery is counted from when you place the order, and the 1–3 business days of preparation sit inside that window rather than being added to it: typically 5–8 business days to the U.S., U.K. 5–8, Europe 4–10, Canada 7–10, Australia 5–10, and elsewhere 7–14. Those are estimates, not guarantees. Every order is covered by our 7-Day Arrival Guarantee: if a piece arrives damaged, defective, or not what you ordered, email us within 7 days of delivery with your order number and clear photos for a free replacement — or a refund if we cannot replace it, at no cost to you. We don’t offer change-of-mind returns, and we’d rather tell you that here than after you buy. Full details are on our Shipping and Returns pages.