Harmony Fine Jewellers Inc.

This stunning 27.15-carat "Birth of the Star" lab-grown moissanite was faceted by Victor Tuzlukov. Gem-quality lab-grown moissanite is always manufactured in labs, although mineral moissanite can on rare occasion be found in nature. Photo: Robert Weldon. Courtesy: Victor Tuzlukov

This 3.02 carat beauty is a contra luz opal from Ethiopia. The play-of-color of this shy gem only manifests itself under transmitted light. In fact, contra luz means "against the light" in Spanish. Courtesy: Uniquegems from http://OpalAuctions.com

The 37.30 carat Raj Pink is the world's largest known Fancy Intense Pink diamond. It was described by GIA graders as an “astonishing stone” with a “bright and ravishing fancy intense pink color.” (1) Photo: Tristan Fewings/Getty Images for Sotheby's. (2) Courtesy: Sotheby's