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Treasures from the earth paired with treasures from the sea. The multi-colored nature of this 7.27 carat Nigerian tourmaline is beautifully brought out by the iridescent akoya cultured pearls surrounding it. Image 2 shows Nigerian tourmaline paired with Tahitian cultured pearls.

Check out the trigons on these natural diamond crystals! Trigons are triangular etch marks that can form when a natural diamond is partially dissolved when it is in the mantle or during transport to Earth’s surface in kimberlite magma. Learn more: https://t.co/cOfMebjP6z

The 118.78 carat Graff Venus, which was graded D Flawless by GIA, is assumed to be the largest heart-shape D Flawless diamond in the world. Get clarity with the 4Cs: https://t.co/ZnMy7x5zRR

Courtesy: Graff

Formed in extreme heat and pressure, diamonds are durable and brilliant. Diamonds also provide jobs and much-needed revenue for the communities that need them the most. Learn more about GIA Diamond Origin: https://t.co/WbweFb7aPI Courtesy: (1) Sotheby's; (2) Peter Johnston/GIA

Seen here are a pink garnet and what is known in the trade as a Malaya garnet. Malaya garnets typically vary from pinkish orange to reddish orange. Image 2 shows other Malaya garnets. Learn more: https://t.co/3XYKPCLQuF (1-2) Photo: Robert Weldon/GIA. (2) Courtesy: Mayer & Watt

Citrine often comes in large sizes with high clarity. Seen here are citrine carvings of a hippo and a mouse by Patrick Dreher and a pair of snow monkeys by Gerd Dreher. Courtesy: (1-2) William F. Larson Family; (3) Silverhorn, Santa Barbara, California

"Night glowing pearls," jewels revered in ancient China, were actually spheres of naturally phosphorescent minerals (not pearls). This particular specimen submitted to the GIA laboratory is fluorite that has been treated to make it phosphorescent. Photo: C. D. Mengason/ GIA

At GIA, we love to celebrate other pioneers in the industry. Modernist jeweler Arthur Smith was one such pioneer, rising to fame in the 1940s for his surrealist and primitivism-inspired jewelry. Courtesy: Art Smith Estate, Mark McDonald, Hudson NY.

These icy #Canadiandiamonds come from one of the coldest places on earth—the Northwest Territories in Canada. Follow this geologist's adventure to find them. https://t.co/nOK4FPh5Zx Photo: Dave Brosha. Copyright: Rio Tinto Diamonds

Two flame-fusion synthetic #sapphires with a Paraíba-like color were examined at GIA’s Carlsbad laboratory. Read the full lab note in the Spring 2019 issue of Gems & Gemology. https://t.co/Tc0ySSecWS