: Ask if the stone has been enhanced or treated.
Opal prices vary significantly based on quality, brightness, and color patterns. Quality Grade Price Range (per Carat) $20 – $500 Boulder Opal $300 – $3,000+ Black Opal Under $100 up to $20,000+ Ethiopian Opal More affordable; often used in mid-range markets buy opal online
: Look for videos showing "play-of-color" in motion under standard lighting. Estimated Pricing (USD) : Ask if the stone has been enhanced or treated