Ruby price: what a ruby is worth per carat
Fine ruby is among the most valuable coloured gems on earth. Colour and origin dominate, and treatment can multiply or collapse the value.
What drives ruby price
Ruby is red corundum. The ideal is a pure, vivid red — the trade term "pigeon's blood" — with strong saturation and a medium tone. Brownish, purplish or pinkish reds are worth considerably less.
Origin
- Burma (Myanmar) — classic "pigeon's blood" reds, the highest premiums.
- Mozambique — the leading modern source, fine stones at strong prices.
- Thailand, Sri Lanka — generally more affordable material.
Treatment
Heating is standard and accepted. Unheated stones with lab reports carry a large premium. At the other extreme, glass-filled (lead-glass composite) rubies are worth a small fraction of natural ruby and are priced as a separate, low category.
Clarity & size
Ruby is Type II; some inclusions are expected, and the famous silk can even soften colour attractively. Fine ruby above 1 ct is genuinely rare, so per-carat prices climb steeply with size.
Ruby price — frequently asked questions
Why is ruby so expensive?
Fine red corundum is rare, especially in larger sizes with vivid "pigeon's blood" colour and no heat treatment. Scarcity plus strong demand pushes top ruby prices above many other coloured stones.
What is "pigeon's blood" ruby?
A trade term for the most prized ruby colour: a pure, intense red with strong saturation and a slight fluorescent glow, classically associated with Burmese (Myanmar) stones.
Are glass-filled rubies worth anything?
Lead-glass composite rubies are worth only a small fraction of natural ruby and are treated as a distinct low-value category. Always confirm treatment with a lab before buying.
Burmese vs Mozambique ruby — which is better?
Burma carries the strongest premium for classic colour. Mozambique is the leading modern source and produces excellent stones, often at more accessible prices.
Indicative trade information from the Gem Index universal pricing engine — not a formal appraisal or laboratory certificate. Wholesale, USD. Species, treatment and origin should be confirmed by an accredited gem laboratory before sale.