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) 21x12,9x4,3mm, 6,5ct
Natural precious opal from Australia (Lightning Ridge) 20,4x15,3x5mm, 9ct
Natural precious opal from Australia (Lightning Ridge) 10,7x8,3x2,7mm, 1,5ct
Natural precious opal from Australia (Lightning Ridge) 12,9x7,4x2,2mm, 1,4ct
Natural precious opal from Australia (Lightning Ridge) 14x6,6x2,8mm, 1,4ct
Natural precious opal from Australia (Lightning Ridge) 18,7x10,4x2,8mm, 3,5ct
Natural precious opal from Australia (Lightning Ridge) 21,9x6x2,9mm, 1,47ct
Natural precious opal from Australia (Lightning Ridge) 14,3x10x4,9mm, 4ct
Natural precious opal from Australia (Lightning Ridge) 14,3x10x3,9mm, 3,2ct
Natural precious opal from Australia (Lightning Ridge) 17x12,4x5mm, 5,9ct
Natural precious opal from Australia (Lightning Ridge) 18,9x11,4x2,2mm, 2,8ct
Natural precious opal from Australia (Lightning Ridge) 16,1x15,1x3,6mm, 5,9ct
Natural precious opal from Australia (Lightning Ridge) 13,4x3,5mm, 4ct
Natural precious opal from Australia (Lightning Ridge) 10,9x6,5x2mm, 0,85ct
Natural precious opal from Australia (Lightning Ridge) 10,4x6x3,2mm, 0,97ct
Natural precious opal from Australia (Lightning Ridge) 9,7x8x2,2mm, 0,93ct
Natural precious opal from Australia (Lightning Ridge) 15,6x12,4x18mm, 2,2ct
Natural precious opal from Australia (Lightning Ridge) 15,7x10,6x28mm, 2,9ct
Natural precious opal from Australia (Lightning Ridge) 12,1x8,4x2,7mm, 1,86ct
Natural precious opal from Australia (Lightning Ridge) 20,7x9x2,2mm, 3,65ct
Natural precious opal from Australia (Lightning Ridge) - 16,5x14,3x4,6mm, 7,09ct
Natural precious opal from Australia (Lightning Ridge) 19,3x16,1x2,6mm, 4,64ct
Natural precious opal from Australia (Lightning Ridge) 7,8x5,8x3,7mm, 0,84ct
Natural precious opal from Australia (Lightning Ridge) 21,5x17,9x5,2mm, 13,3ct
Natural precious opal from Australia (Lightning Ridge) 6,3x5,7x1,7mm, 0,37ct
Natural precious opal from Australia (Lightning Ridge) 12,7x6,9x5mm, 2,51ct
Natural precious opal from Australia (Lightning Ridge) 15,8x12,4x4,5mm, 5,67ct
Natural precious opal from Australia (Lightning Ridge) 14x7,6x1,3mm, 0,87ct
Natural precious opal from Australia (Lightning Ridge) 15,3x14,2x2,6mm, 3ct
Natural precious opal from Australia (Lightning Ridge) 15,9x8,5x2,6mm, 2,56ct
Natural precious opal from Australia (Lightning Ridge) 9,9x5x2,9mm, 0,81ct
Natural precious opal from Australia (Lightning Ridge) 10,3x4,7x2,7mm, 0,81ct
Precious opal from Ethiopia - Wello - 10x4,7mm, 2,18ct