Stars which seem to hover within a gemstone are a precious rarity in nature. A stone for the connoisseur, at its most beautiful when the light hits it from above.
Formula: Al2O3
Hardness: 9
Density: 3.90 – 4.05 g/cm3
Refractive Index: 1.760- 1.772 DR: 0.008
Color:
Blue (more commonly grey, maroon or black)
Countries of Origin:
Sri Lanka, Myanmar, India, Australia
Birthstone: September