Black opal is from Lightning Ridge, Australia. Solid natural black opals are the rarest opals in the world as each opal is so unique when formed, it is very rare to get 2 opals the same colour and brightness. Red fire is the rarest colour followed by orange then greens and blues. Opal varies in different shades and patterns also making this one of the most unique gems in the world. The more cabochon the stone and more unique pattern, like harlequin or mackerel, the more expensive the opal. black opal is also graded in colour density N1–N5, N5 being the darkest and N1 the lightest. Black opals are among the best gemstone investments. Source your black opals direct from opal miners and opal wholesalers and dealers for your single gem opal or parcel black opals from lightning ridge Australia