the best opal can be more valuable than the best rarest black diamond
The rarest type of coral is the Elkhorn coral.
No it isn't. The rarest is AB negative.
The rarest you can get is groudon who is a fire-machine type pokemon.
The types of Opal that i am familiar with are White Opal, Fire Opal, Boulder Opal, Black Opal, Crystal Opal, Light Opal, Doublet Opal, Triplet Opal, Common Opal, Synthetic Opal, and Immitation Opal.
iregular
normal
No. Peridot is olivine.
The rarest type of blood is O. people with O type blood can donate blood to anybody and there are very few people that have this blood type. It is extremely rare.
...The Purple Rose!
The Gem Tang!
O positive is the most common and AB negative is the rarest.