Buy - Opal

Red is the rarest and most expensive, followed by orange, yellow, green, and blue.

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

Unlike other gems, opal value is subjective and based on "eye appeal".