Black opal (Black and Dark opal or semi-black) - the color of the base material is black, semi-black, dark gray to light gray. Coloring is due to the presence of carbonaceous substances in the molecular structure. It features a number of beautifully opalescent rich colors highlighted with black or dark backgrounds. It is always accompanied by a general opal, the so-called "dots" (the same color as the base mass). black opal is found in layers of clay.
Natural precious opal from Australia (Lightning Ridge) - 8,5x6,4x3mm, 1ct
Natural precious opal from Australia (Lightning Ridge) - 8,3x7,1x2,3mm, 0,76ct
Natural precious opal from Australia (Lightning Ridge) - 9,2x5,7x1,7mm, 0,57ct
Natural precious opal from Australia (Lightning Ridge) - 7,1x3,9x2,3mm, 0,38ct
Natural precious opal from Australia (Lightning Ridge) - 10,1x5,8x2,7mm, 0,94ct
Natural precious opal from Australia (Lightning Ridge) - 6x5,1x2,1mm, 0,31ct
Natural precious opal from Australia (Lightning Ridge) - 6,4x3,9x2,5mm, 0,37ct
Natural precious opal from Australia (Lightning Ridge) - 7x4,2x1,2mm, 0,22ct
Natural precious opal from Australia (Lightning Ridge) - 7,6x4,3x2,8mm, 0,62ct
Natural precious opal from Australia (Lightning Ridge) - 11,7x5,7x2,7mm, 0,96ct
Natural precious opal from Australia (Mintabie) - 26,6x17,6x3,2mm, 9ct
Natural precious opal from Australia (Mintabie) - 26,5x17,8x2,9mm, 8ct
Natural precious opal from Australia (Lightning Ridge) - 16,2x16,3x3,5mm, 5,82ct
Natural precious opal from Australia (Lightning Ridge) - 25x16,2x3,6mm, 8,66ct
Natural precious opal from Australia (Lightning Ridge) - 21x12,4x4,4mm, 7,88ct
Natural precious opal from Australia (Lightning Ridge) - 22x15,8x4,2mm, 7,77ct
Natural precious opal from Australia (Lightning Ridge) - 15,9x11,3x2,6mm, 2,84ct
Natural precious opal from Australia (Lightning Ridge) - 18,2x11,7x3mm, 4,36ct
Natural precious opal from Australia (Lightning Ridge) - 21,8x16,1x4,7mm, 9ct
Natural precious opal from Australia (Lightning Ridge) - 9x5x2,4mm, 0,64ct
Natural precious opal from Australia (Lightning Ridge) - 11,1x6,5x2,8mm, 1,31ct
Natural precious opal from Australia (Lightning Ridge) - 20,9x13,2x4,4mm, 7,2ct
Natural precious opal from Australia (Lightning Ridge) - 29x12,8x3,7mm, 7,4ct
Natural precious opal from Australia (Lightning Ridge) - 7x5,1x4mm, 0,79ct
Natural precious opal from Australia (Lightning Ridge) - 12,8x8,5x3,9mm, 2,67ct
Natural precious opal from Australia (Lightning Ridge) - 14,3x9,6x2,9mm, 2,37ct
Natural precious opal from Australia (Coober Pedy) - 8x6,1x2,4mm, 8x6,1x2,1mm, 1,55ct
Natural precious opal from Australia (Coober Pedy) - 8x6x2,7mm, 7,9x6,2x2,6mm, 1,69ct
Natural precious opal from Australia (Lightning Ridge) - 17,2x12x5mm, 5,31ct
Natural precious opal from Australia (Lightning Ridge) - 15x8,8x2,8mm, 2,1ct
Natural precious opal from Australia (Lightning Ridge) - 12,8x11,5x3,8mm, 3,31ct
Natural precious opal from Australia (Lightning Ridge) - 19,6x10,7x5,2mm, 5,77ct
Precious opal from Ethiopia - Wello - 11,8x9x5,2mm,...