How Much Is a Sapphire Worth Per Carat?

Sapphire is the same mineral as ruby, corundum, in every color except red, which means the family covers blue, pink, yellow, green, purple, and the rare orange-pink padparadscha. Blue dominates the market and its pricing runs on color quality first and origin second. The ideal is a vivid, medium to medium-dark blue with strong saturation and no grey or green modifier. Origin premiums are steep and well established: Kashmir sapphires, mined for a brief period in the 1880s and 1890s, are the most valuable stones in the category and sell for extraordinary sums; Burmese and Ceylon material follows; Madagascar, Thailand, and Australian stones sit below. Treatment matters as much as it does with ruby, since most commercial sapphire is heat treated and unheated stones command two to four times the price. Beryllium diffusion treatment, which alters color at depth, is a separate category that must be disclosed and substantially reduces value.

Color quality leads, judged on hue, saturation, and tone, with the most valuable blues being vivid and neither too light nor inky dark. Origin creates enormous premiums, and Kashmir occupies a tier so far above the rest that certified Kashmir stones routinely set auction records. Treatment status is the next major factor, with unheated stones commanding two to four times heated equivalents of the same appearance. Clarity is assessed more forgivingly than in diamonds, and fine silk inclusions can create the velvety appearance prized in Kashmir material. Cut affects brilliance significantly and windowing is common because cutters preserve weight. Size drives exponential price growth above two carats. Fancy colors follow their own logic, with padparadscha commanding premiums because its precise pink-orange range is so narrow that few stones qualify. Certification from SSEF, Gübelin, GRS, or GIA is expected on any significant stone.