Star Ruby - Sternrubin

The the star-like effect is caused by "Asterism". Asterism is generated by reflections of light from twin-lamellae or from extremely fine needle-shaped acicular inclusions within the stone's crystal structure. A common cause is oriented sub-microscopic crystals of rutile within the gem mineral.

 

For this weeks "Looking close...on Friday!"

Thank you for viewing, commenting and / or adding this photo to your favorites. It's very much appreciated!

 

 

Done