Opal Butte crystal with contra luz color with spectacular visual effect. It looks like an underwater view of the ocean floor as light shines through it. There's a surreal quality about the gemstone that looks like a pocket-sized aquarium.
An early century aquamarine and diamond necklace. The front composed of three delicate quatrefoil clusters, millegrain-set throughout with cushion-shaped and oval-cut aquamarines and old brilliant and single-cut diamonds, connected by similarly.