Black star sapphire displays a golden six-rayed star gliding over a dark corundum body — asterism born of oriented rutile and hematite needles. Thailand and Cambodia’s historic Chanthaburi–Pailin region are classic sources, and the stone’s hardness of 9 makes it superbly wearable.Every black star sapphire at GEMIC Institute is natural, tested and certified in our Siem Reap laboratory, with video showing the star in motion on the exact stone offered. Unique pieces; tracked shipping worldwide, 30-day returns.