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This starfish carved by Patrick Dreher shows different colors of quartz that occurred in the same crystal. The starfish itself is carved from "strawberry" quartz and rests on coral carved from amethyst. Courtesy: William F. Larson family.

Type Ia diamonds typically vary from near-colorless to light yellow, while type Ib diamonds can be bright yellow. The ring seen here features a 31.17 carat diamond graded Fancy Vivid yellow by GIA. Learn more about diamond types: bit.ly/3NGrHLn. Courtesy: @ChristiesInc

Simply dubbed "The Rock." This 228.31 carat diamond graded G, VS1 by GIA, is the largest colorless diamond to appear at auction and the largest existing D-to-Z color pear-shaped diamond ever graded by GIA. Learn more: gia.edu/diamondexperts Courtesy: Christie's

At the close of Women's History Month, we are celebrating women who make a difference throughout the gemstone supply chain. From miners to merchants to gemologists - from Vietnam, Tanzania and Myanmar to Thailand - these women are powerful and indispensable!

Image 1 shows quartz with star-like actinolite inclusions. Image 2 shows quartz with a bent rutile inclusion. Image 3 shows a 7,000 carat quartz egg housed in the Smithsonian Institution. Which is your favorite? 1) Courtesy: Bill Heher. 3) Courtesy: Smithsonian Institute

Ametrine is a combination of amethyst and citrine in the same crystal, and the Anahí mine in Bolivia is the only commercial source. The ametrines seen here display vivid colors made more dramatic by stunning fantasy cuts. Courtesy: Minerales y Metales del Oriente, Bolivia, SA

Spinel comes in a wide range of colors. Red tends to be the most sought after color of spinel, although gray has risen in trendiness in recent years. We love the steely beauty of violet to blue spinel seen in these rings, however. Photo: Blanca Espinoza. Courtesy: Omi Privé

Most demantoid garnet from the Green Dragon Mine in Namibia is small, but once in a while gems are found in larger sizes. The round brilliant cut demantoid seen here weighs 11.63 carat. Learn more: bit.ly/3qnWdQc Courtesy: Green Dragon Mine Company, Namibia.