Alexandrite
Location :
Originally discovered in Russia's Ural Mountains in the 1830s, it's now found in Sri Lanka, East Africa and Brazil -but fine material is exceptionally rare and valuable.
Colour
Bluish green in daylight,purplish red in incandescent light
Hardness Index
8.5
Refractive Index
1.746 to 1.755
Specific Gravity
3.73
Often descirbed by gem aficionados as "emerald by day, ruby by night", Alexandrite is the very rare color-change variety of the mineral chrysoberyl.