Most valuable; provides the highest contrast for colors. N7–N9 (White/Light): More common and affordable. Play-of-Color: The "rainbow" effect.
Rare patterns like Harlequin (large distinct patches) or Flagstone significantly increase value. ⚒️ Main Types of Opals Opal Quality Factors | Types of Opal - GIA buy opal
The most critical factor. A bright B1 stone is far more valuable than a dull B7 stone, regardless of size. Body Tone (N1–N9): The base color of the stone. Most valuable; provides the highest contrast for colors