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. 19,3x15,5x3,4mm, 6,82ct
Natural precious opal from Australia. 11,6x8,2x1,8mm, 0,81ct
Natural precious opal from Australia. 15,3x7,4x2,8mm, 1,77ct
Natural precious opal from Australia (Lightning Ridge) 9,8x7,5x2mm, 0,79ct
Natural precious opal from Australia (Lightning Ridge) 12x5,6x2,7mm, 0,98ct
Natural precious opal from Australia (Lightning Ridge) 13,5x8,7x4,8mm, 3,32ct
Natural precious opal from Australia (Lightning Ridge) - 7,2x5,6x3,1mm, 0,59ct
Natural precious opal from Australia (Lightning Ridge) - 8,1x5,8x2,5mm, 0,85ct
Natural precious opal from Australia (Lightning Ridge) - 7,4x5,2x1,8mm, 0,34ct
Natural precious opal from Australia (Lightning Ridge) - 10,5x5,7x2,1mm, 0,88ct
Natural precious opal from Australia (Lightning Ridge) - 12,9x11,6x2,6mm, 2,41ct
Natural precious opal from Australia (Lightning Ridge) - 10,3x7,7x4mm, 1,87ct
Natural precious opal from Australia (Lightning Ridge) - 6,2x5,7x2,9mm, 0,56ct
Natural precious opal from Australia (Lightning Ridge) - 9,4x4,3x2,6mm, 0,63ct
Natural precious opal from Australia (Lightning Ridge) - 7,2x6,6x2,2mm, 0,63ct
Natural precious opal from Australia (Lightning Ridge) - 8,8x5,6x2,4mm, 0,66ct
Natural precious opal from Australia (Lightning Ridge) - 12x10,3x4,6mm, 3,03ct
Natural precious opal from Australia (Lightning Ridge) - 13,9x10,8x3,6mm, 3,18ct
Natural precious opal from Australia (Lightning Ridge) - 11x9,4x3mm, 2,23ct
Natural precious opal from Australia (Lightning Ridge) - 13,9x6,7x3,7mm, 2,82ct
Natural precious opal from Australia (Lightning Ridge) - 11,3x6,4x1,9mm, 0,92ct
Natural precious opal from Australia (Lightning Ridge) - 7,8x5,5x1,8mm, 0,46ct
Natural precious opal from Australia (Lightning Ridge) - 9,3x4,3x2,8mm, 0,81ct
Natural precious opal - 9,5x7,8x3,3mm, 1,72ct
Natural precious opal from Australia (Lightning Ridge) - 7,8x7,6x2,2mm, 1,2ct
Natural precious opal from Australia (Lightning Ridge) - 15x11,6x2,6mm, 3.21ct
Natural precious opal from Australia (Lightning Ridge) 13,4x4,3x2,4mm, 0,76ct
Natural precious opal from Australia (Lightning Ridge) 8,2x4,7x1,8mm, 0,44ct
Natural precious opal from Australia (Lightning Ridge) 13x5,4x2mm, 0,86ct
Precious opal from Ethiopia - Wello - 11,8x9x5,2mm,...