The 4 Cs determine value: Color (40%), Clarity (30%), Cut (20%), and Carat weight (10%). Rarity, origin, and treatment status also significantly affect price.

Quality 1 carat sapphires range from $500-$3,000 AUD depending on color, clarity, and origin. Untreated Queensland sapphires typically cost $800-$2,000 per carat for good quality.

Yes. Untreated stones are most valuable (100%), heat-treated are 70-90% of untreated value, and heavily treated stones are 20-50% of untreated value. Always ask about treatments.

Rarity drives price. Exceptional color, large size, flawless clarity, and untreated status are rare. Kashmir sapphires, Burmese rubies, and Colombian emeralds command premium prices due to rarity and origin.

Compare prices from multiple reputable dealers, check certification, verify treatment status, and research market rates. If price seems too good to be true, it probably is. See our buying guide.