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) 7,8x6,1x0,9mm, 0,26ct
Natural precious opal from Australia (Lightning Ridge) 10,9x6,3x2,8mm, 1,1ct
Natural precious opal from Australia (Lightning Ridge) 11,4x6x3,3mm, 1,2ct
Natural precious opal from Australia (Lightning Ridge) 11x6,5x1,8mm, 0,82ct
Natural precious opal from Australia (Lightning Ridge) 12,3x6,5x2,1mm, 1ct
Natural precious opal from Australia (Lightning Ridge) 9x6,2x2mm, 0,61ct
Natural precious opal from Australia (Lightning Ridge) 8x6,2x3,4mm, 1ct
Natural precious opal from Australia (Lightning Ridge) 9,7x5,6x2,7mm, 0,96ct
Natural precious opal from Australia (Lightning Ridge) 21,5x5,7x3,3mm, 2,66ct
Natural precious opal from Australia (Lightning Ridge) 11x7,8x2,7mm, 1,76ct
Natural precious opal from Australia (Lightning Ridge) 13,6x8,7x2,8mm, 2,3ct
Natural precious opal from Australia (Lightning Ridge) 13,8x7,2x2,5mm, 1,36ct
Natural precious opal from Australia (Lightning Ridge) 9,1x8,5x2,4mm, 1,38ct
Natural precious opal from Australia (Lightning Ridge) 14,8x8,8x3,4mm, 2,8ct
Natural precious opal from Australia (Lightning Ridge) 12,7x12x3,7mm, 3,47ct
Natural precious opal from Australia (Lightning Ridge) 14,2x12x4mm, 4,44ct
Natural precious opal from Australia (Lightning Ridge) 15,2x6,2x2,7mm, 1,71ct
Natural precious opal from Australia (Lightning Ridge) 15x14,5x4mm, 4,44ct
Natural precious opal from Australia (Lightning Ridge) 8,3x5,8x2,7mm, 0,83ct
Natural precious opal from Australia (Lightning Ridge) 9,8x6,4x2,5mm, 1,1ct
Natural precious opal from Australia (Lightning Ridge) 9,6x5,6x2,2mm, 0,83ct
Natural precious opal from Australia (Lightning Ridge) 10,3x9,8x2mm, 1,27ct
Natural precious opal from Australia (Lightning Ridge) 9x7,3x3mm, 1,2ct
Natural precious opal from Australia (Lightning Ridge) 11,8x9x3,4mm, 2,25ct
Natural precious opal from Australia (Lightning Ridge) 13,4x9,8x2,7mm, 1,46ct
Natural precious opals from Australia. Dark opal, Crystal Opal
Natural precious opals from Australia. A mixture of the rarest types of precious opal. Black opal, Dark opal.
Natural precious opals from Australia. A mixture of the rarest types of precious opal. Black opal, Dark opal.
Natural precious opal from Australia (Lightning Ridge) 29,5x21,2x5mm, 21,5ct
Natural precious opal from Australia (Lightning Ridge) 23,7x23x5,4mm, 15,5ct
Natural precious opal from Australia (Lightning Ridge) 11x8,6x2,9mm, 1,63ct
Natural precious opal from Australia (Lightning Ridge) 8,9x7,7x2mm, 0,67ct
Precious opal from Ethiopia - Wello 11,3x7,3x4,5mm, 1,4ct