Excellent gem Corundum var. Sapphire crystal from Ratnapura, Sri Lanka. It displays 17mm single Sapphire crystal. It is complete all over 360 degree with irregular hexagonal shape.  The Sapphire is transparent and gem with blue color. It is very lustrous, glassy and light reflective. One damage at the lower back side. On acrylic base.
Superb Sapphire!