: Found in ironstone boulders; the opal is often left attached to its dark host rock, giving it a natural, rugged look and high durability.
: Australian opals (from places like Lightning Ridge) are globally renowned for their brilliance and durability. Ethiopian opals are stunning and often more affordable but are frequently "hydrophane" (absorbent), meaning they can temporarily lose their colour if soaked in water. 3. Buying Tips & Authenticity Opal Quality Factors | Types of Opal - GIA
: Some patterns are highly prized by collectors, such as Harlequin (broad, square patches) or Pinfire (tiny, dense specks). buy opal stone
: Graded from N1 (black) to N9 (white). Generally, the darker the base, the more valuable the stone.
: The rarest and most expensive. Its dark body tone makes the vibrant colour flashes "pop" more intensely. : Found in ironstone boulders; the opal is
: Transparent or semi-transparent stones where the play-of-colour appears to dance within the body of the gem.
: Famous for its warm, fiery orange-red base colour. Unlike others, these are often faceted and may or may not show play-of-colour. 2. Essential Quality Factors Generally, the darker the base, the more valuable the stone
Buying an opal is like purchasing a piece of a rainbow. Unlike traditional faceted gems, opals are valued for their —a shimmering, multi-coloured fire caused by light diffracting off microscopic silica spheres. 1. Know the Primary Types