Coral stone is a unique marble with thousands of 50 million years old fossils embedded within. Specimen visible in the stone vary in size from less than half an inch to over two inches long, Red Onyx is also know as banded onyx because it is formed in layers. The color ranges from deep to light Maroon and brown veins. Our skillful artisan has beautifully crafted each chess piece with special care and attention and make a stunning combination of Coral (Sand Stone) and Red Onyx (Onyx) . Every chess board has black velvet felt on its back side to protect the surface of furniture.