- A lab-grown diamond is chemically and optically a diamond. Moissanite is silicon carbide, a separate gem that mimics the look.
- Hardness: diamond sits at 10 on the Mohs scale, moissanite at about 9.25. Both handle daily wear.
- Sparkle: a diamond throws crisp white light, moissanite throws more rainbow fire that can flash like a tiny disco ball in strong sun.
- Price in India, 2026: moissanite is roughly Rs 8,000 a carat, a lab-grown diamond roughly Rs 30,000 to Rs 80,000 a carat depending on quality.
- A gem tester or a lab report separates them in seconds. Neither is a fake of the other. They are two honest choices at two price points.
What each stone actually is
Start with what you are holding. A lab-grown diamond is carbon, arranged in the exact crystal structure of a mined diamond, grown over a few weeks in a reactor instead of a few billion years underground. Its hardness, its light behaviour, its chemistry: all identical to the stone that comes out of the earth. If you want the long version, I wrote a full lab-grown versus natural diamond guide that compares the two on every point.
Moissanite is a different animal. It is silicon carbide, and in nature it is so rare that the moissanite in jewellery is grown in a lab from the start. It was never meant to be a diamond. It is its own gem that reads as diamond-like to the eye, which is exactly why people love it and exactly why the two get confused. The GIA lists moissanite as one of the most convincing diamond simulants, alongside cubic zirconia.
Hardness and everyday wear
For jewellery you actually wear, hardness is really about how a stone survives keys, desks, dupattas and years of small knocks. Diamond is the hardest natural material, a 10 on the Mohs scale. Moissanite is close behind at about 9.25, still harder than a sapphire and far harder than anything your daily routine will throw at it.
The practical difference is slow. A diamond's facet edges stay razor-crisp for decades. Moissanite is tough too, with no cleavage plane to chip along, so it resists knocks well, though over many years of hard wear its edges can soften a touch sooner than a diamond's. For a stud you wear to work or a pendant you never take off, both will look good far longer than you expect.
The sparkle question: white brilliance or rainbow fire
This is where the two stones part ways, and it comes down to taste rather than quality. A diamond bends light at a refractive index of 2.42 and disperses it fairly gently, so it reads as bright, clean, white sparkle with flashes of colour. Moissanite has a higher refractive index and more than twice the dispersion, so it throws far more rainbow fire. In a small stud you can barely tell them apart. Above roughly half a carat, and especially in direct sun, moissanite's fire becomes obvious, a lively rainbow flash some people adore and others find a little much.
Neither look is better. If you want the quiet, icy sparkle people picture when they think diamond, the diamond delivers it. If you want the most flash for your money, moissanite is hard to beat. The International Gem Society breaks down the optics if you want the raw numbers.
Price in India, 2026
Price is usually the reason anyone lines these two up in the first place. Here is the current picture in rupees, per carat, for good near-colourless quality.
| Factor | Lab-grown diamond | Moissanite |
|---|---|---|
| What it is | Carbon, a real diamond | Silicon carbide, a simulant |
| Mohs hardness | 10 | About 9.25 |
| Sparkle | Crisp white brilliance | Bright rainbow fire |
| Approx price per carat (India, 2026) | Rs 30,000 to Rs 80,000 | Around Rs 8,000 |
| Lab paperwork | IGI or GIA diamond report | Moissanite certificate from the maker |
| Best for | A real diamond, quiet white sparkle | Maximum flash on a tight budget |
Two things worth knowing. Moissanite runs roughly 70 to 85 percent less than a lab-grown diamond, so a budget that buys a half-carat diamond can buy a carat-and-a-half of moissanite at the same size. And lab-grown diamond prices, which fell sharply between 2022 and 2024 as global production scaled, have largely settled in 2026. The freefall is over, so a lab-grown diamond today is priced calmly rather than dropping under your feet.
How jewellers and testers tell them apart
Because the two look similar, people worry about being misled. In practice they are easy to separate. A basic diamond tester reads thermal conductivity, and a moissanite tester adds electrical conductivity, so a two-in-one pen tells them apart in seconds. Under a loupe, moissanite shows a faint doubling of its back facets that a diamond never does. And any lab-grown diamond worth buying comes with an IGI or GIA report that names the stone outright. I go deeper into this in the guide on whether lab-grown diamonds can be identified.
So which should you choose?
There is no single right answer. There is only what you want on your hand and what you want to spend.
Choose a lab-grown diamond if
- You want an actual diamond, graded and reported as one.
- You prefer clean white sparkle over rainbow flash.
- You are building jewellery you plan to keep and hand down.
Choose moissanite if
- Your budget is the deciding factor and you want the most size for it.
- You love a lively, rainbow sparkle in the light.
- You are happy owning a diamond look rather than a diamond.
At our house we set lab-grown diamonds and a few coloured gemstones, not moissanite, because a diamond's white sparkle is the look we build around. If that is your look too, a simple solitaire diamond ring or a petite diamond pendant is a lovely place to begin, and you can see the range across our necklaces. If rainbow fire and the lowest price win the day for you, moissanite is a genuinely good stone, and I would rather you buy it happily than buy a diamond you were talked into.
FAQs
Is moissanite worth it?
Yes, if you want a durable, very sparkly stone for far less money. Moissanite costs about 70 to 85 percent less than a lab-grown diamond and wears well every day. Just know you are buying a diamond look, not a diamond, and its rainbow fire shows more in larger sizes.
Can people tell moissanite from a diamond?
Not usually by eye in small sizes. A jeweller can, instantly. A moissanite tester reads its electrical conductivity, and under magnification moissanite shows a slight doubling of facets that a diamond never does. Above half a carat, its extra rainbow fire can also give it away in sunlight.
Is a lab-grown diamond a real diamond?
Yes. A lab-grown diamond has the same carbon crystal, hardness and optics as a mined diamond. Labs like IGI and GIA grade it as a diamond and note only that it was lab grown. It is not a simulant the way moissanite or cubic zirconia is.
Which lasts longer, moissanite or a lab-grown diamond?
Both last a lifetime of normal wear. Diamond is harder at 10 Mohs versus about 9.25, so its facet edges stay crisp longest. Moissanite has no cleavage plane and resists chipping well. For everyday studs or pendants, the difference is barely noticeable.
Why did lab-grown diamond prices drop?
Global CVD and HPHT production scaled up fast between 2022 and 2024, and wholesale prices fell steeply as supply grew. In 2026 those prices have largely settled, so a lab-grown diamond is now priced steadily rather than falling week to week.
The honest bottom line
Moissanite and lab-grown diamonds are not rivals so much as two answers to two different questions. If the question is how to get real diamond sparkle without the old mined-diamond price, a lab-grown diamond is your stone, and prices have finally steadied enough to buy one calmly. If the question is how to get the most sparkle for the smallest spend, moissanite earns its place. Either way, buy the one you will love wearing, and browse our lab-grown diamond designs whenever you are ready to begin.
