This unique natural gemstone (druzy quartz) is heat treated with vivid color then coated with titanium (a metallic vapor) which creates an iridescent finish. This particular color is called peacock, a grey undertone with pink, blue and green accents. Note the view of the stone from the back, where it's flat and polished. This stone is combined with silicone spacer beads and beautiful clear precision cut crystals and finished with a sterling silver toggle clasp.