Black opal is the most coveted of all opal varities. The "black" in black opal means the gem has a very dark body tone. A black opal can be crystal or opaque. The rarest colour is red, next is green and orange with blue as the most common colour.
Blue Eyris Pearls - Pearls from the sea creatures known as abalone are incredibly rare. They cannot be cultured like the pearls from mussels and oysters; abalone are all hemophiliacs. They bleed to death when injected with a nucleus. in nature