Synthetic-diamond makers received a boost in January when the Gemological Institute of America--the organization that invented the color, cut, clarity and carat diamond standards 50 years ago ...

Tiffany & Co. recently acquired a massive 71-carat rough yellow diamond—it's now been cut into two stunning emerald-cut stones that are now for sale.

The current record for the most expensive diamond or any gemstone sold at auction is held by the CTF Pink Star, a 59.60-carat oval mixed-cut diamond auctioned at Sotheby’s Hong Kong in April ...