The entire top of the specimen is covered with many sharp quartz and sphalerite crystals that seem as if they are holding onto the Chalcopyrite

This Henbury glass

The color is attributed to manganese and lithium impurities in the crystal structure

Dimensions:  145x77x2

Star Sapphire | Pear Shape Cabochon | Royal Blue | 9x6.7mm | SO24 IIAB The entire top of theProduct Type: Star Sapphire Approx Weight (per piece): 2. 8ct Size: 9x6. 7mm Shape: Pear Shape Cabochon Color: Royal Blue Clarity: Opaque Sharp 6 Rays Star Origin: Thailand Treatment: Diffusion* *This gemstone was heated and surface diffused to improve its appearance. This is a routine and safe treatment that is accepted worldwide.