Hollandite, which appears as dark, star-like clusters within a purple amethyst gemstone, creating a unique visual effect often described as "sea urchin" formations; essentially, it's a naturally occurring black mineral trapped inside the amethyst during its formation process, making the amethyst particularly valuable due to its distinctive appearance.
This 17 x 7mm crystal has been cut and set into an adjustable sterling silver ring with a floral design. The ring is adjustable and will best fit sizes 7 - 9
