: Rated on a scale from N1 (blackest) to N4 (dark gray) . The darker the base, the more the colors "pop," generally increasing the price.
: Rare patterns like Harlequin (checkerboard) or Flagstone (large blocks) command massive premiums over common "pinfire" or "flash" patterns. 2. 2026 Price Guide buy black opal
: Look for Red , the rarest and most expensive hue, followed by orange, yellow, green, and blue. : Rated on a scale from N1 (blackest) to N4 (dark gray)