Burma Ruby: Mogok Origin, Pigeon Blood, and 2026 Per-Carat Prices

Mogok and Mong Hsu — what "Burma" covers on a lab report

The Burma ruby trade runs out of two geologies. Mogok, in the Mandalay region, is the historic source — marble-hosted corundum that produces a pure red with strong chromium fluorescence and very fine silk that softens the colour without dulling it. Almost every iconic Burma ruby at auction over the last century traces to Mogok. Mong Hsu, in Shan State, is the modern high-volume source discovered in the late 1980s; most Mong Hsu material carries a blue or purple core that is removed by heat treatment, so the typical Mong Hsu ruby on the market is heated.

Both read as "Burma (Myanmar)" on an origin report. The labs that maintain deep reference populations — SSEF, Gübelin, AGL, GRS — can in many cases separate Mogok from Mong Hsu by inclusion fingerprint and trace-element chemistry, and a stated Mogok provenance on the report carries a meaningful premium over an unspecified Burma call.

Why pigeon blood is the colour grade that prints money

"Pigeon blood" is the trade name for the colour at the very top of the ruby curve: a pure red, very slight bluish secondary, medium-to-strong saturation, with the chromium fluorescence still firing under incandescent light. The term is used informally everywhere — by retailers, by auction catalogues, by dealers at the show. It only carries weight on the report. GRS defines the colour grade spectroscopically and prints "Pigeon Blood" on the document when the stone meets the spec. Gübelin uses "pigeon's blood red" with its own reference protocol. SSEF uses "vivid red" for the equivalent tier. A retailer's claim of pigeon blood with no lab citation is a marketing line.

Which labs the auction market accepts for Burma ruby

For high-value Burma ruby lots at Christie's, Sotheby's, Bonhams, and Phillips, the accepted origin labs are:

• SSEF (Swiss Gemmological Institute, Basel) — the European auction standard for Burma ruby, with a vivid-red colour designation on the report when the stone qualifies.
• Gübelin Gem Lab (Lucerne) — co-equal with SSEF in Europe, with the Gemtrack origin-tracing pedigree on top of the chemistry.
• AGL (American Gemological Laboratories, New York) — the dominant name in the US market for ruby origin.
• GRS (GemResearch Swisslab, Lucerne / Bangkok) — heavily used in Asia, with the explicit "Pigeon Blood" colour-grade nomenclature.
• GIA — issues origin opinions on ruby and is accepted at most houses; for the very top of the Burma ruby market the trade still defaults to SSEF, Gübelin, AGL or GRS first.

A retailer's in-house "certificate", a local-lab report from an unaffiliated lab, or paperwork from a lab that does not maintain a Burma reference population is not Burma documentation at this price level. A stone sold as Burma with no SSEF / Gübelin / AGL / GRS / GIA report is being sold on the seller's word.

The treatment math

Heat treatment is industry-standard and is disclosed on the report. The price tiers it creates are the largest non-origin variable in ruby:

• No indications of heating — the prestige tier. Top per-carat ranges assume this line on the report.
• Indications of heating — heated by conventional means with no residue. Drops the stone roughly 3–8x for fine material.
• Lead-glass filling / clarity enhancement by glass — disqualifying for investment-grade. The stone is a composite, traded by weight at industrial prices.
• Beryllium diffusion — diffused colour, disqualifying for fine jewelry. The chemistry shows it; the labs report it.

2026 per-carat ranges at auction

These bands are derived from recent Christie's and Sotheby's Geneva and Hong Kong results plus AGL and SSEF circulation. Treat them as directional — a half-shade colour difference inside the pigeon-blood band can move the per-carat rate by 30–50%, and a stated Mogok provenance can add another 20–40% on top of the Burma call.

Checklist before you wire money

1. Origin report from SSEF, Gübelin, AGL, GRS, or GIA — and an origin report, not a basic identification report.
2. Verify the report number on the issuing lab's website. Match weight, measurements, and the report photo to the stone in front of you.
3. Heat status stated explicitly. "No indications of heating" is the prestige tier; anything else changes the per-carat band by a multiple.
4. Colour grade printed on the report — "pigeon blood" (GRS) or "pigeon's blood red" (Gübelin) or "vivid red" (SSEF). A retailer-only claim of pigeon blood is not the same thing.
5. Inspect the stone in daylight, incandescent, and LED. Pigeon blood holds its colour and fluoresces under incandescent; a Thai or African ruby of similar saturation will often go inky or grey under the same light.
6. Match the asking price to the table above. If the ask is $80,000/ct on a stone whose paperwork supports a $20,000/ct band, the gap is the negotiation — or the exit.

Read alongside

• Ruby buying guide — the full ruby framework across origins, treatments, and colour grades.
• Investing in colored gemstones — what the secondary market actually pays for the big three.
• Reading a gemstone lab report — what the SSEF, Gübelin, AGL and GRS reports actually say, line by line.
• Kashmir sapphire origin guide — the sapphire-side equivalent of this page.
• Colored gemstone origin guide — the parent hub covering all four origins.