A detailed overview of Paraiba tourmalines, covering mineralogical composition, color origin, treatments, and how they’re assessed in the gem trade.

This Alexandrite Guide outlines the gemological and optical characteristics of Alexandrite, a color-change variety of chrysoberyl.

Discover why TWAK Gems focuses on natural gemstones in bespoke jewelry. Learn about our Gem to Jewelry program and exclusive Gems & Cheers event

Ametrine is a rare and visually striking gemstone that blends the violet tones of amethyst with the golden warmth of citrine — all within a single crystal. Sourced almost exclusively from the legendary Anahí Mine in Bolivia, this bi-color quartz is admired for its natural beauty, symbolic meaning, and suitability for custom, handcrafted jewelry. Discover why Ametrine stands out among the world’s most captivating gems.