Moissanite and diamond can look similar at first glance, but they are different gemstones with different optical properties, origins and prices. For an Indian buyer, the right choice depends on the look you prefer, how you plan to wear the jewellery and what you want your budget to achieve.
Short answer: choose moissanite for stronger rainbow fire and accessible everyday wear. Choose a laboratory-grown or natural diamond if the distinct appearance, composition and meaning of diamond matter more to you.
Where moissanite came from
French chemist Henri Moissan identified tiny crystals of silicon carbide while studying material from Arizona's Canyon Diablo meteorite in 1893. The mineral was later named moissanite in his honour.
Natural moissanite is exceptionally rare and occurs only in very small quantities. The gem-quality moissanite used in jewellery today is therefore created in a laboratory. It is silicon carbide, not diamond, cubic zirconia or a type of laboratory-grown diamond.
Moissan received the 1906 Nobel Prize in Chemistry for isolating fluorine and for his work with the electric furnace. The prize was not awarded for discovering moissanite, although that discovery remains an interesting part of his scientific career.
The science without the sales language
Three measurements help explain how moissanite and diamond behave in jewellery: hardness, refractive index and dispersion.
Hardness
Diamond scores 10 on the Mohs scale. Moissanite scores about 9.25, making it highly resistant to scratches and suitable for regular wear. Hardness is not the same as toughness, so either stone can still be damaged by a hard impact.
Brilliance
Moissanite has a refractive index of approximately 2.65 to 2.69, compared with about 2.42 for diamond. Its light return can look lively and intense, although cut and cleanliness also affect how much a stone sparkles.
Fire
Dispersion creates coloured flashes. Moissanite's dispersion is about 0.104, while diamond's is about 0.044. Moissanite can therefore show more rainbow fire, especially in bright or direct light.
Appearance
Some buyers love moissanite's colourful flashes. Others prefer the more restrained pattern of diamond. Neither preference is more correct; they are visibly different once you know what to look for.
Moissanite and diamond at a glance
What the BIS terminology standard means in 2026
The Bureau of Indian Standards lists IS 19469:2025, Jewellery: Consumer Confidence in the Diamond Industry, as a modified adoption of ISO 18323:2015. The standard is designed to make terminology clearer and reduce confusion between natural diamonds, laboratory-grown diamonds and diamond simulants.
Under this terminology, the word “diamond” used on its own refers to a natural diamond. A laboratory-grown diamond should be described clearly as “laboratory-grown diamond” or “laboratory-created diamond.” Moissanite must be sold as moissanite because it is a different material, not a diamond.
For buyers, the practical lesson is simple: the product description, invoice and supporting documents should identify the stone accurately. If a seller uses vague language or cannot explain what the stone is, pause before purchasing.
What certification can and cannot tell you
Laboratories such as IGI and GIA issue grading reports for diamonds, including laboratory-grown diamonds. Moissanite does not use the same universal diamond grading framework, and documents offered with it can vary in scope and authority.
A “GRA certificate” is not automatically equivalent to a report from a widely recognised gemmological laboratory. Check who issued the document, whether its number can be verified and exactly what it confirms. For a valuable purchase, you can also ask an independent gemmologist to identify the stone.
Before buying: confirm the stone type in writing, review the seller's return and warranty terms, and verify any laboratory report with the issuing organisation.
Which stone should you choose?
Choose moissanite if
- You enjoy strong brilliance and noticeable rainbow fire.
- You want a highly scratch-resistant stone for regular wear.
- You prefer a laboratory-created gem with no gemstone mining involved.
- You want a larger-looking centre stone within a more accessible budget.
Choose a laboratory-grown diamond if
- You want the chemical composition and optical character of diamond.
- You prefer a laboratory-created origin.
- Your budget allows for the current price difference.
Choose a natural diamond if
- Natural geological origin and rarity are important to you.
- You prefer the traditional cultural associations of diamond.
- You understand that resale value is separate from the original retail price and is never guaranteed.
There is no universal winner. The best choice is the stone whose appearance, origin, documentation and price fit your priorities.
Frequently asked questions
Is moissanite the same as cubic zirconia?
No. Moissanite is silicon carbide and scores about 9.25 on the Mohs scale. Cubic zirconia is zirconium dioxide and generally scores around 8 to 8.5. Cubic zirconia can show surface wear sooner, while moissanite is more scratch resistant.
Can people tell moissanite and diamond apart by eye?
Many people cannot tell at a quick glance. In bright light, moissanite may show stronger rainbow flashes. A trained gemmologist can identify the stones using magnification and suitable testing equipment.
Will moissanite lose its sparkle?
Its optical properties do not simply fade with age. Oil, soap and daily residue can dull the surface of any gemstone, so regular gentle cleaning helps restore its appearance.
Is moissanite suitable for an everyday ring in India?
Yes. Its scratch resistance makes it practical for frequent wear. Choose a secure setting, remove the ring for heavy manual work and follow the care guidance provided by the jeweller.
Explore Myraé's moissanite guide and collection, or contact us if you would like to see how a stone looks in different lighting.
Sources and further reading: GIA, synthetic moissanite properties; BIS, IS 19469:2025; Nobel Prize, Henri Moissan; FTC gemstone buying guidance.