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Lightning Ridge Black Opal. It gets its name from a real Australian town in New South Wales and is one of the rarest kinds of opal on the planet.

from Raymond Lee Jewelers Blog

$3 Million Black Opal Finds Unlikely Guardian

= o - a 306 carat black opal some Australian dude spent 2 years chiseling out of rock with a dental drill. Hid it under his mattress for 12 years (of course) and it's now up for grabs in Vegas... for $3 mill.