How to Buy a Sapphire: Colour, Origin, Heat and Price

Colour comes first

For sapphire, colour is the most important quality factor, followed by clarity, cut, carat weight and treatment. The most valuable blue sapphires show a saturated, medium-to-medium-dark royal or cornflower blue with no grey or green secondary tone.

Look at the stone under daylight and warm indoor light. Good Ceylon material stays bright; overly dark stones 'close up' and look inky at night.

Heated vs unheated

Around 95% of sapphires on the market are heated — a stable, accepted treatment that improves colour and clarity. Unheated stones of equal quality command a premium of 30–100%.

Only an independent laboratory (GRS, GIA, SSEF, Gübelin) can confirm the absence of heat. For any stone above $3,000 insist on a report.

Does origin matter?

Kashmir, Burma and Ceylon (Sri Lanka) carry historic premiums. Madagascar now produces sapphires that rival Ceylon at lower prices. Montana sapphires are prized in the USA for their teal and parti colours and fully traceable mining.

Price per carat in 2026

Commercial heated blue sapphire of 1–2 ct trades from $500–1,500 per carat. Fine heated royal blue of 2–3 ct reaches $2,000–4,000 per carat, and top unheated Ceylon exceeds $6,000 per carat.