Hardness 9
Refractive Index 1.762 – 1.778
Relative Density 3.97 – 4.05
Treatment Heated with light elements

Sunset Ruby was named in tribute to the beauty of a Cambodian sunset, while Ruby gets its name from the Latin ‘ruber’, meaning red. Even though Sunset Ruby was seemingly depleted in the late 90s, it is still sporadically mined by small artisanal miners who sift the earth to uncover these rare gemstones. Ruby is one of the rarest of the better-known gemstones and the official birthstone for July. Ruby is far rarer than Diamonds and is also the world’s most expensive gemstone, excluding Imperial Jade and some uncommon natural Diamond colors.

Along with Diamond, Emerald and Sapphire, Ruby is the ‘big red’ in the ‘big four’ of the gemstone kingdom. Mined along the Thai/Cambodian border from alluvial deposits, Sunset Rubies lack strong fluorescence due to their high iron content. A major international trading hub, Thailand is the middle point for 90 percent of the world’s Rubies as they distribute across global markets.

Color varieties of the mineral Corundum (crystalline aluminum oxide), Rubies and Sapphires are gemstones colored by trace amounts of elements such as chromium, iron and titanium or color centers. Corundum’s other colors are called ‘Sapphire’, while its reds are called ‘Ruby’.