Moissanite or lab-grown diamond
They are different materials that look alike. Lab-grown diamond is a real diamond and costs more; moissanite is nearly as hard, sparkles with more rainbow, and costs a fraction. Nobody on the street will tell them apart.
Side by side
| Moissanite | Lab diamond | |
|---|---|---|
| Material | Silicon carbide | Carbon |
| Hardness | 9.25 | 10 |
| Sparkle | Rainbow flashes | White flashes |
| Color | Colorless | Graded D to K |
| Passes pen tester | Usually | Yes |
| 0.5 ct here | see shop | see shop |
| 1 ct here | see shop | see shop |
| 1.5 ct here | see shop | see shop |
| 2 ct here | see shop | see shop |
Prices are the lowest in the shop today for that stone and carat, in 925 silver. Moissanite is lighter than diamond, so a "1 ct" moissanite is cut to the size of a 1 ct diamond, about 6.5 mm across.
What people notice in real life
- Under office light and daylight: nothing. Both are clear, bright stones.
- Under a spotlight or in the sun: moissanite throws more colored flashes. Diamond flashes whiter. Above 2 carats this is where a trained eye sees it.
- After a year: both look the same as day one if you clean them. Neither scratches in normal life.
- On the product page and your order: the stone by name and its carat. We never call moissanite a diamond.
Who should pick which
- Moissanite if the budget matters more than the word, if you want the biggest stone for the money, or if you love the extra fire.
- Lab-grown diamond if it matters to you or your partner that it is a diamond, if you want the whiter flash, or if a jeweler might test it one day.
- Either for a ring you will wear for ten years. Both last that long without effort.
Resale and insurance, honestly
Neither holds resale value. Lab-grown diamond prices have fallen for years and moissanite was never a store of value, so treat both as jewelry, not as an investment. For insurance, ask your renters or home insurer; many add a ring at the price on your receipt.
Questions
Can anyone tell the difference?
Not by eye in daily life. A jeweler with an electrical tester can, in seconds. A heat pen usually cannot.
Which holds value?
Neither, in the sense of getting your money back. Both hold up physically for life.
Why is the diamond so much more at 1 carat?
It takes weeks to grow and more skill to cut, and demand for the word diamond keeps the price up. The table above shows the exact gap today.
Is one more ethical than the other?
Both are lab-made, so neither involves mining. Moissanite uses less energy to grow.
Which would I pick for a ring I will wear for 10 years?
Either. If you cannot decide, moissanite at the carat you want beats a smaller diamond for the same money.
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