Lightning Ridge in New South Wales, Australia is the world's only significant commercial source of black opal - the rarest and most valuable form of opal. Premium quality semi-black and crystal opal is also found in this area. Mining commenced in 1902 and it continues today on approximately two hundred distinct opal fields.
The darkest sunflash crystal with a consistent large blocky pattern of alternating red,
blue, green, orange that shows best with bright light over shoulder.
Very pretty blue pendant stone with some green flash amidst the swirls of black.
Undeniably Ridge opal and priced low enough for everyday wear.
A fun picture stone with the grey and black "magpie potch". The green is
bright and glittery enough even in moderate light to make this a nice opal.
Excellent stone. Precious opal top-to-bottom. Minor sand spots in face
and interior inclusion in lower left center. Still an outstanding opal.
Bright seam opal on a dark potch base. Blue, green, orange, and gold colors
are bright even in moderate to low light. Large impressive flat-topped face.
Real designer's delight. Semi-crystal opal with color throughout. The line visible
in the interior is "growth line" between two opal layers, not a crack.