Amethyst Heart CharmA 6mm heart cut amethyst with white CZ rounds at 1. 5mm in a 16. 58. 7mm 925 sterling silver setting the Amethyst Heart combines the most universally recognised form with a stone colour that does more with the shape than clear or white stones can. Deep purple in a heart cut creates an intensity at the stone's point that reads differently from the neutral versions of this charm. The white CZ accents frame the stone without dulling the colour. At 0.