Instagram LogoPinterest LogoFacebook LogoTikTok LogoTwitter Logo
Olive Ave Jewelry Logo

MM to Carat Conversion

Conversion charts to show the comparison between mm & carat

The carat is the traditional unit of measurement for a diamond’s weight. Moissanite is not measured in carats because it weighs approximately 10 percent less than diamond. For example, a 6.5mm round diamond would weigh 1.00ct, while a 6.5mm round moissanite would weigh 0.88ct. The two stones would be the same size – 6.5mm in diameter. View the charts below to compare mm/carat conversions for multiple stone shapes & sizes.

Olive Ave Promise

Olive Ave Jewelry is the new face of a family-owned and operated jewelry company that has been in business for over 40 years, first established in 1981 as The Diamond Consortium.


Our focus is to bring the highest quality jewelry to our customers for the best price. We are happy to offer our curated selection, or help you customize the perfect ring for the one you love.

Learn More