Vibrant Quantum Quattro Natural Gemstone 925 Sliver Square Pendant Stunning 🤩 Quantum Quattro is a synergetic crystal first discovered in Namibia and is very rare. It's a combination stone made of five copper-based crystals Chrysocolla, Malachite, Shattuckite, Dioptase, and Smoky Quartz matrix. Elegant blue stone pendant necklace perfect for any occasion. The vibrant blue color adds a touch of sophistication to your outfit.