Natural Untreated Ametrine Cushion Cut Loose Gemstone – 18.28Ct Concave Cut Bi-Color Purple & Gold Collector Gem, 20x15mm Earth Mined Gemstone

This extraordinary natural ametrine showcases the mesmerizing blend of golden citrine and royal purple amethyst in a single gemstone — a phenomenon found in only a small handful of mines worldwide. Expertly fashioned in a crisp cushion cut with an intricate concave faceting pattern, this 18.28 carat loose gem delivers exceptional depth, brilliance, and movement from every angle. Measuring an impressive 20x15mm, its larger size makes it ideal for a bold custom ring, pendant, or heirloom statement piece. Untreated and earth-mined, this gemstone retains its natural beauty exactly as nature created it.

The concave cut elevates this ametrine far beyond a traditional faceted gem, creating dramatic flashes of light and a liquid-like dimensionality that feels alive in motion. The striking contrast between the warm honey tones and rich violet hues gives the stone an almost sunset-like glow, making it equally captivating in yellow, rose, or white gold. Rarely seen in this combination of size, clarity, cut quality, and untreated status, this gem is a true collector-worthy centerpiece for someone seeking a one-of-a-kind jewelry creation.