Burmese ruby, Kashmir sapphire, Colombian emerald: stones of rare provenance are read, valued and bought directly at 22 rue Drouot, by a trained gemmologist.
Two rubies of the same weight can differ tenfold in value: origin, treatment and colour decide. A trained gemmologist, Ariel Altmann reads the stone itself and knows what the international market pays for each provenance — then makes a firm offer, with immediate payment. See also diamond appraisal.
Free appraisal, immediate offer, immediate payment.
Burma (Mogok), Mozambique, Thailand. Unheated Burmese rubies above all.
Kashmir, Burma, Ceylon, Madagascar. Padparadscha and fine blues, heated or not.
Colombia (Muzo, Chivor), Zambia, Brazil. Minor or no oil preferred.
Saltwater natural pearls, strands and single pearls, with or without a report.
Rare gems with documented provenance.
Pink, blue, yellow — certified or not.
Verifiable facts, reviewed in September 2026.
Unheated Burmese ruby, Kashmir sapphire, Colombian emerald: origin and the absence of treatment are paid for. For a significant stone, an independent laboratory report (SSEF, Gübelin, GRS, LFG) attests them.
Heating of rubies and sapphires, oiling of emeralds: long-standing, accepted practices — always disclosed, never at the price of an untreated stone.
Both are appraised. Never unset a stone before the opinion: a period or signed mounting can be worth more than the stone alone.
Origin and the absence of treatment, first. An unheated Burmese ruby, a Kashmir sapphire, a Colombian emerald with minor oil: these are the stones the international market pays for. Then colour, clarity, cut and weight.
For a significant stone, yes: an independent laboratory (SSEF, Gübelin, GRS, LFG) attests origin and treatment. We tell you when a report is needed, and which one. We are a dealer, not a laboratory.
No. Heating rubies and sapphires, and oiling emeralds, are long-standing, accepted practices — always disclosed, and never at the price of an untreated stone.
Both are appraised. Never remove a stone from its setting before the opinion: a period or signed mounting can be worth more than the stone alone.
Free verbal appraisal at 22 rue Drouot, firm offer on the spot, no fees or commission, immediate payment. From abroad, a first opinion from photographs within 24 hours.
Free and confidential appraisal, reply within 24 hours.
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