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) - 13,6x7,9x2,9mm, 1,98ct
Precious opal from Australia - Coober Pedy - 5,9x5,8x1,6mm, 0,27ct
Natural precious opal from Australia (Lightning Ridge) - 7,3x6,8x1,8mm, 0,49ct
Natural precious opal from Australia (Lightning Ridge) - 7,6x4,3x2mm, 0,37ct
Natural precious opal from Australia (Lightning Ridge) - 5,2x3,3x2,3mm, 0,21ct
Natural precious opal from Australia (Lightning Ridge) - 19,3x10,4x4,7mm, 5,39ct
Natural precious opal from Australia (Lightning Ridge) - 8x5,8x3,4mm, 0,87ct
Natural precious opal from Australia (Lightning Ridge) - 24x9,6x2,6mm, 2,98ct
Natural precious opal from Australia (Lightning Ridge) - 12,6x9,2x5mm, 3,31ct
Natural precious opal from Australia (Lightning Ridge) 13,6x9,8x3mm, 2,47ct
Natural precious opal from Australia (Lightning Ridge) 9,3x6,9x3mm, 1,21ct
Natural precious opal from Australia (Lightning Ridge) 7,4x5,7x1,5mm, 0,36ct
Natural precious opal from Australia (Lightning Ridge) - 22,4x13,1x2mm, 3,95ct
Natural precious opal from Australia (Lightning Ridge) Dark opal N5, brillance 3,5, 14,6x11,4x3,6mm, 3,51ct
Natural precious opal from Australia (Lightning Ridge) 20,2x8,4x2,8mm, 3,06ct
Natural precious opal from Australia (Lightning Ridge) Dark opal N6, brillance 4,3, 8,5x5x3,2mm, 0,96ct
Natural precious opal from Australia (Lightning Ridge) - 23,6x15,3x3,4mm, 7,17ct
Natural precious opal from Australia (Lightning Ridge) - 15,4x10,5x2,6mm, 2,86ct
Natural precious opal from Australia (Lightning Ridge) - 8,9x7,7x3,4mm, 1,74ct
Natural precious opal from Australia (Lightning Ridge) - 7x6,3x1,6mm, 0,45ct
Natural precious opal from Australia (Lightning Ridge) - 26,9x8x5,6mm, 7,41ct
Natural precious opal from Australia (Lightning Ridge) - Black Opal, 20,7x12x4,5mm, 6,72ct
Natural precious opal from Australia (Lightning Ridge) - Black Opal, 36,6x17,4x4,5mm, 16,51ct
Natural precious opal from Australia (Lightning Ridge) - Black Opal, 18,5x15,9x3,4mm, 6ct
Precious opal from Australia - Coober Pedy - 7,9x7,9x2,5mm, 0,93ct
Natural precious opal from Australia (Lightning Ridge) - Black Opal, 17,5x9,7x2,5mm, 2,64ct
Natural precious opal from Australia (Lightning Ridge) - 17,1x11,3x2,1mm, 2,47ct
Natural precious opal from Australia (Lightning Ridge) - semi-black opal, 12x8x3,2mm, 1,76ct
Natural precious opal from Australia (Lightning Ridge) - 23,2x12,1x3,2mm, 4,05ct
Natural precious opal from Australia (Lightning Ridge) - 15x8,4x2,5mm, 2,27ct
Natural precious opal from Australia (Lightning Ridge) - semi-black opal, 13,7x11,2x2,6mm, 2,61ct
Natural precious opal from Australia (Lightning Ridge) - black opal, 18,2x9x4,6mm, 4,78ct
Natural precious opal from Australia (Lightning Ridge)...