Hackmanite 6mm Round - 15-16 Inch Diamond commonly with inclusions of copper

commonly with inclusions of copper in speckled patterns throughout the stone

At that time yellowish gems were called "topaz" in many parts of the world

where it was mined since around 300 BCE

It is a particularly unusual gem because it exhibits a special optical property known as tenebrescence

Hackmanite 6mm Round - 15-16 Inch Diamond commonly with inclusions of copperDiscovered in Greenland in the late 1890's, hackmanite is named for Finnish geologist Victor Hackman. It is a rare occurrence to find gem grade hackmanite; at best, most crystals are translucent. Hackmanite is the light pink to pale violet variety of sodalite. It is a particularly unusual gem because it exhibits a special optical property known as tenebrescence, a type of reversible photochromism. Hackmanite is very reactive under UV light.