Loose Natural Sapphire Gemstones

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Understanding Carat Weight

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Approximate gemstone size on a U.S. size 6 finger

0.07 ct 33.10 ct

Carat (ct.) is the standard unit used to weigh natural gemstones, including the certified sapphires, rubies, emeralds, and other loose gemstones in our collection, and one gram equals 5 carats. Every gemstone listed on Jamsora shows its exact carat weight alongside its independent lab certificate, so you always know precisely what you're buying.

Matched pairs: when a listing is sold as two stones together, the carat weight shown is their combined total, not the weight of each individual stone.

Carat weight alone doesn't fully describe how large a gemstone will look once set, since two stones of equal weight can appear different sizes depending on their cut and proportions. For a more reliable sense of a stone's visual size, check its millimeter dimensions (length × width × depth), listed on every product page alongside its carat weight and certificate details.

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Gemstone Guide

About Sapphire Gemstone

Sapphire is corundum in every color except red — most famously the deep, velvety blue caused by trace iron and titanium, though fine sapphires also occur in pink, yellow, white and the rare pink-orange padparadscha hue. At 9 on the Mohs scale, sapphire is exceptionally hard and scratch-resistant, making it one of the most practical gemstones for daily-wear jewelry as well as one of the most collected. The finest blue sapphires have historically come from Kashmir, though Ceylon (Sri Lanka), Burma and Madagascar all produce natural sapphires of exceptional color and clarity. Many sapphires are heat-treated to improve clarity and intensify color, a standard, disclosed practice in the trade. Every natural sapphire in Jamsora's collection ships with an independent certificate confirming its authenticity, origin and any treatment, so you can buy a certified sapphire online with full confidence in what you're getting.

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