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) - 12,7x8,7x5,3mm, 3,19ct
Natural precious opal from Australia (Lightning Ridge) - 13,9x10,4x4,2mm, 3,73ct
Natural precious opal from Australia (Lightning Ridge) - 9,3x4,8x2,3mm, 0.61ct
Natural precious opal from Australia (Lightning Ridge) - 15,7x12x3,9mm, 3,83ct
Natural precious opal from Australia (Lightning Ridge) - 10x9x3,1mm, 2,03ct
Natural precious opal from Australia (Lightning Ridge) - 14,6x9,6x3,1mm, 2,96ct
Natural precious opal from Australia (Lightning Ridge) - 12x10,1x2,1mm, 2,53ct
Natural precious opal from Australia (Lightning Ridge) - 15,3x13x3mm, 3,75ct
Natural precious opal from Australia (Lightning Ridge) - 31,8x16,2x4,5mm, 12,51ct
Natural precious opal from Australia (Lightning Ridge) - 23,8x11,4x3,2mm, 5,82ct
Natural precious opal from Australia (Lightning Ridge) - 25,8x16,7x5,3mm, 11,6ct
Natural precious opal from Australia (Lightning Ridge) - 27,2x19,2x6mm, 18,87ct
Natural precious opal from Australia (Lightning Ridge) - 9,1x7,3x3,7mm, 1,51ct
Natural precious opal from Australia (Lightning Ridge) - 12,6x10,4x3mm, 2,54ct
Natural precious opal from Australia (Lightning Ridge) - 11,8x7x3mm, 1,54ct
Natural precious opal from Australia (Lightning Ridge) - 17x7x3,4mm, 2,33ct
Natural precious opal from Australia (Lightning Ridge) - 10,9x8,4x2,5mm, 1,19ct
Natural precious opal from Australia (Lightning Ridge) - 12,3x5x2,3mm, 0,86ct
Natural precious opal from Australia (Lightning Ridge) - 24,5x15,7x3,9mm, 9,54ct
Natural precious opal from Australia (Lightning Ridge) - 21,4x17,5x3,4mm, 7,14ct
Natural precious opal from Australia (Lightning Ridge) - 16,2x12,6x2,2mm, 3,01ct
Natural precious opal from Australia (Lightning Ridge) - 15,5x9,7x2,5mm, 2,22ct
Natural precious opal from Australia (Lightning Ridge) - 15,6x8,8x2,4mm, 2,24ct
Natural precious opal from Australia (Lightning Ridge) - 14,4x10,2x3mm, 2,65ct
Natural precious opal from Australia (Lightning Ridge) - 15,4x12x2mm, 2,43ct
Natural precious opal from Australia (Lightning Ridge) - 14x9,9x4,3mm, 3,41ct
Natural precious opal from Australia (Lightning Ridge) - 13,4x9,2x3mm, 2,42ct
Natural precious opal from Australia (Lightning Ridge) - 11,5x7,4x3mm, 1,41ct
Natural precious opal from Australia (Lightning Ridge) - 9x7x2,3mm, 0,82ct
Natural precious opal from Australia (Lightning Ridge) - 5,01ct, 13,9x12,3x4,8mm
Natural precious opal from Australia (Lightning Ridge) - 16,4x12,8x3,1mm, 3,79ct
Natural precious opal from Australia (Lightning Ridge) - 29,2x19,4x4,8mm, 13,93ct
Natural precious opal from Australia (Lightning Ridge)...