Star Saphires are unique Sapphires that exhibit, under specific light, an effect called asterism, where a six rayed star is visible on the top of the gem.
They are often within the inner part of a large gem quality Sapphire rough, which makes them even more unique and precious.
 
Details and description:
Dimensions: 12.27 x 9.25x 5.77mm
Weight: 7.26ct
Colour: Greyish Blue
Certificate: ALGT 23583112 
It is our opinion that this stone is from Madagascar (not mentioned on the certificate)
 
An added value of this certified Sapphire is that this stone was not subject to any treatments to enhance its colour or the star quality, whereas most Star Sapphires are subject to treatment, including heating and beryllium diffusion,
 
The stone is opaque, with minor surface flaws, and with a well-formed star under the penlight. We have also provided pictures under white light, so the stone details and formation can be well appreciated.
 
Please contact us for any other details or clarifications.