: Rare patterns like Harlequin (checkerboard) or Flagstone (large blocks) command massive premiums over common "pinfire" or "flash" patterns. 2. 2026 Price Guide
Unlike diamonds, opals have no universal grading system, but their worth is driven by these core elements: buy black opal
Expect a wide range based on quality. Current market data suggests: How to Buy Opals : Rare patterns like Harlequin (checkerboard) or Flagstone