However, in incandescent light, it shows a deep purple flash. This custom-cut, 1.33-ct sapphire from the Umba Valley in Tanzania shows a violet-blue color in daylight. These sapphires show one color in daylight or fluorescent light and another in incandescent light.

Traces of vanadium may cause color change in some sapphires.

Sapphires get their extraordinary colors from trace elements such as iron, titanium, chromium, and others. Rough sapphires: purple and pink from Madagascar, blue from Kashmir, chartreuse and white from Montana, USA. On the market, blue sapphires are usually simply called sapphires, while sapphires of other colors are commonly specified as yellow sapphires, pink sapphires, etc, and are collectively known as 'fancy sapphires.' However, when discussing the physical and optical properties of sapphires, the term 'sapphire' applies to all sapphires regardless of color. All other colors of gem-quality corundum are considered sapphires. CommentsĪll red, gem-quality corundum gems are considered rubies. Faceted sapphire gemstones (and a few rubies) from around the world, from 0.5 to 5 cts.

Black sapphire