Solid Semi-Black Opal from Lightning Ridge. Australian Natural Solid Semi-Black Opal 1.95ct Rare Gem from Lightning Ridge - YouTube. Video will open in a new window.This opal is more beautiful than it appears on the pictures! It lights up with bright green color! It's fantastic under any light. You'll love this one! 4 out of 5 in brightness. This stone is very good quality. Perfect cut and polish, no dead or weak spots. I only sell solid(natural) black, crystal and boulder opals from Lightning Ridge. The measurements of the stone. Note: 1 Inch equals 25.4 Millimeters. Don't miss out on this truly beautiful solid semi-black opal! Rest of the world FREE. All the opals i sell are professionally cut and polished by me. I have been in the wholesale opal business for over 15 years. All the opals that I sell are solid Lightning Ridge opals that are NOT treated in any way. The item "Australian Natural Solid Semi Black Opal 1.95 ct Rare Gem from Lightning Ridge" is in sale since Tuesday, November 23, 2010. This item is in the category "Jewelry & Watches\Loose Diamonds & Gemstones\Loose Gemstones\Opal\Other Opals". The seller is "mik989" and is located in Lane Cove, New South Wales. This item can be shipped worldwide.