THIS IS FROM THE LARGE PARCEL OF SAPPHIRES AND I THOUGHT WHEN CUTTING IT WAS GOING TO BE LOUPE CLEAN; BUT WHEN FINISHED THE GEM SHOWS THE TYPICAL SIX SIDED CRYSTAL STRUCTURE INSIDE THE TABLE. I COULD NOT HAVE LINED IT UP MORE CENTER. YOU DO NOT SEE IT FROM A FOOT AWAY BUT IF YOU TIP IT RIGHT YOU CAN SEE THE CRYSTAL STRUCTURE. THIS GEM IS UN-HEATED AND VERY UNIQUE. VERY FINE BLUE AND STILL HAS A TON OF FLASH.. BARGAIN PRICED...