Van Cleef & Arpels's newest high jewelry collection, Treasure Island, was just unveiled in Miami—and it is unbelievably chic.

From Tanzanite to Benitoite, this article unveils the five rarest gemstones in the world that hold more than vibrant colors.

A rare square 37-carat emerald owned by the Aga Khan fetched nearly USD 9 million at an auction in Geneva on Tuesday. Details here.