Blue Star Sapphire from Thailand – Oval Cabochon

About Star Sapphire

Star sapphire is the star-forming variety of corundum, the mineral species that also includes ruby. Its colours range from blue, grey and violet to pink, yellow, green, brown and black; colourless material is uncommon. It is usually translucent to opaque rather than transparent. The characteristic optical effect, called asterism, is a moving star caused by fine, needle-like inclusions—most often rutile—arranged in…