Sweet as sugar, with none of the calories! My new Sugar Cube Necklace is a unique holiday gift, at a great price. Created with hammered rock crystal and sterling silver, the surface texture of the crystal cube resembles a tasty hunk of rock candy. Yum. While you're at it, soothe that sugar rush, with a Crystal Calm Bracelet, or earrings, and the natural healing energy of pure rock crystal.