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

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

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...

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

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...

victorApril 10, 2012 at 5:28 pmI have a very large piece of raw black star saphire. It weighs about 16 oz and is about the size of the palm of my hand...

sammyJanuary 10, 2010 at 7:25 pmWhat will be the price of a 120 ct natural black star sapphire? Thank you. jo woodsJanuary 20, 2010 at 6:58 amHi ther...

Coco RenaudSeptember 27, 2009 at 5:54 pmI know a man named Jack, who says he was the owner of the big black stone and that Harry Winston kept it from ...

NadeemJuly 30, 2009 at 3:46 pmSomeone sent me a test report from Dubai for 3 Star Sapphire stones, 1 Blue (204 Carat) one Black (120 Carat) one black ...

Gemstone geographic origin determination is a science that is still in its infancy and not yet fully developed, despite the advances in science and te...

Thanks Barry for your contribution, on Melo pearls, Abalone pearls and the rare Concho river pearls derived from the fresh water mussel Cyrtonaias Tam...

Identification of inclusions is the first criterion used by gemologists in determining the country of origin of a blue sapphire. As pointed out earlie...

Some characteristics of Kashmir sapphires are found in most sapphires of Kashmiri origin, but are not unique to Kashmir sapphires as they are sometime...

With regards to gemlite's next question as to the possibility of some of the characteristics of Sri Lankan sapphires overlapping with that of Kashmir ...