Pigeon’s Blood: What the Term Certifies

The term arrives before the stone does. A seller writes pigeon’s blood in a message and waits for the price to follow. Sometimes the words are on a report. Often they are doing work no laboratory authorised.

Pigeon’s blood is a colour appellation. It describes a vivid red at full saturation, carrying the fluorescence fine Burmese material is known for, and it is granted only after a laboratory has examined the stone. SSEF and Gübelin harmonised their criteria in 2015 — brilliance across the face, no dominant window, colour that holds. That is the closest this trade has come to a shared definition.

Not every laboratory plays. GIA does not use the term at all; its reports describe colour in their own language and never mention a pigeon. A stone without those words on paper is not automatically a lesser stone — it may simply have gone to a laboratory that declines trade vocabulary. Others grant the appellation more readily, and the same ruby can travel between laboratories and come back wearing a different name.

What the term does not certify: clarity, cut, proportion, or the absence of heat. Those are separate lines on the report, and they are the lines I read first. A stone can carry the appellation and still be sleepy, windowed, or heated, depending on which laboratory signed it.

My own order of work does not change for two words. I judge colour in daylight, against master stones, before I look at the paper. If the colour is there, the laboratory will say so in whatever language it prefers. If a seller leads with the term and the report is on request, he is selling the term.

Where the words came from

The term is an old Burmese trade word for the top of the red scale, and the explanations offered for it are picturesque and useless. None of them will help you judge a stone. What matters is that the trade adopted the phrase long before any laboratory did, and that for most of its life it meant whatever the seller needed it to mean. The laboratories borrowed it in the last few decades and tried to give it edges.

What the houses actually require

The harmonised SSEF and Gübelin wording asks for a vivid red at full saturation, a medium tone, strong red fluorescence in daylight, brilliance across the face and no dominant window. GRS grades on its own colour scale and grants the term to stones that would not qualify in Basel or Lucerne. Lotus in Bangkok issues it against its own set. GIA describes the colour in its own language and never writes the words. So the first question to ask of any report carrying the appellation is which house wrote it and what that house requires, because a report is one laboratory’s opinion, and here the opinion is the name itself.

What it does to the price

The gap between a ruby sold with the words and the same ruby sold without them is one of the widest a single phrase opens anywhere in coloured stones. That gap is the commercial risk. Buy on a call from a house the next buyer does not accept and you sell the stone twice, the second time cheaper, with the stone itself unchanged. My rule for borderline material is to ask whether the strictest house I can name would grant the term. If not, I price the stone as fine red ruby and stop thinking about the phrase. The stone does not know what is written about it, and neither should your price.

Dealers love a phrase that carries a premium. My rule is older and duller: buy the stone, then read the paper, and never in the other order.

Questions collectors ask

Which laboratories issue the pigeon’s blood appellation?

SSEF and Gübelin, which harmonised their criteria in 2015, GRS with its own vocabulary, and Lotus Gemology in Bangkok, each against its own reference stones. GIA does not use the term at all. The same ruby can travel between houses and come back with different words on the paper.

Does pigeon’s blood mean the ruby is unheated?

Not by itself. The appellation describes colour and fluorescence. Treatment is a separate line on the report, and depending on the house a heated stone can carry the words. Read the treatment line first; the colour name comes last.

Is a ruby without the term a lesser stone?

No. It may have gone to a laboratory that declines trade vocabulary, or sit a shade outside one house’s limits while inside another’s. The stone is what it is in daylight against master stones. The words are one laboratory’s opinion about where it sits.