Rare patterns like Harlequin (large distinct patches) or Flagstone significantly increase value. ⚒️ Main Types of Opals Opal Quality Factors | Types of Opal - GIA
Unlike other gems, opal value is subjective and based on "eye appeal". 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. Rare patterns like Harlequin (large distinct patches) or