Hi!, I´m new in the forum, I´ve found it very interesting, thank you all!I was reading about the Nautilus pearls.My mother owns an object, I think it ...

Sapphire is crystalline Aluminium Oxide (Al2O3)known as Corundum, the second hardest on the Mohs scale after diamond. Sapphires crystallize in the tri...

What actually causes the black color in black star sapphires ?

Thanks Mary for your contribution. The images you uploaded not only show distinct rays, but also bundles of rutile/haematite fibres/platelets laid dow...

Wow Mary !!! Your images are indeed stunning and informative. I have seen 12-rayed blue star sapphires before. Honestly, this is the first time I am s...

A stunning range of black star sapphires, of Thailand origin, some extremely rare, can be seen at the online shopping portal of the renowned Bangkok-b...

Thanks for your detailed reply. I can now appreciate the reasons behind the decision of the Arkansas State authorities to keep the Crater of Diamonds ...

The following is a list of notable diamonds discovered at the Crater of Diamonds State Park arranged in descending order of carat weights of the rough...

Thanks for your information Diamanta. I too came across images of some stunning black star sapphires set in some exquisitely crafted pieces of jewelry...

Since the largest rough diamond ever discovered in the Crater of Diamonds State Park in Arkansas weighed only 40.23 carats, it follows that most of th...

Thank you Diamanta, for your contribution. The images you have uploaded are indeed stunning and hopefully useful for all participants in this forum.

I came across the following natural black/grey star sapphires of extraordinary size and quality, with perfect radiating stars and mounted on exquisite...

In the history of exploitation of diamonds in the Crater of Diamonds State Park in Arkansas, previously known as the Prairie Creek Pipe Mine, since di...

What is the largest rough diamond ever discovered in the history of exploitation for diamonds at the Crater of Diamonds Park ?