Tiffany & Co. released its latest Blue Book high jewelry collection with serious stones set in familiar Schlumberger themes ...

If 'The Golconda Blue' went to auction it would have been the largest fancy blue diamond to have been presented at a public ...

A historic blue diamond once worn by Indian royalty is expected to fetch between $35m and $50m when it goes under the hammer in May. The 23.24-carat gem, known as the Golconda Blue, is set to lead ...

Its latest Blue Book is a love letter to the ocean. Witness the artistry in its "Sea of Wonder" collection.