What is a Mogok pigeon-blood ruby?

A pigeon-blood ruby is the highest colour grade of ruby — a vivid, slightly purplish-red with strong fluorescence under daylight. Mogok refers to the Burmese (Myanmar) valley that has produced the most celebrated pigeon-blood stones for over 800 years. Independent labs (GIA, Lotus, GRS, SSEF, Gübelin) certify the colour grade based on hue, saturation, and tone — vendor opinion alone is not pigeon-blood.

How do I know a ruby is from Mogok and not Mozambique or Thailand?

Origin determination is made by accredited gemmological laboratories (GIA, Lotus, SSEF, Gübelin, GRS) using inclusion patterns, trace-element fingerprints (Cr, Fe, Ti, V), and spectroscopic data. Skyjems sells only origin-certified rubies, with the lab letter included at delivery. Mozambique rubies have stronger Fe content; Mogok rubies show distinctive silk and crystal inclusions and characteristic UV fluorescence.

Are Mogok rubies usually heated?

The majority of commercial Mogok rubies are heat-treated to improve clarity and colour, which is a stable, accepted enhancement. Unheated Mogok rubies command a 30–100% premium when colour is comparable, especially at sizes above 2 carats. Skyjems carries both, with treatment status disclosed on every product page from the lab report.

What carat weight defines investment-grade Mogok ruby?

For Mogok pigeon-blood ruby, the investment-grade threshold is generally 2 carats and above for unheated stones, or 3 carats and above for heated. Auction-record ruby (e.g., Christie's Sunrise Ruby) skews to 5–10+ carats. Skyjems' [investment collection](https://skyjems.ca/collections/investment) curates stones meeting size, origin, and certification thresholds.

Which lab reports does Skyjems accept for Mogok ruby?

Skyjems' default certifications for Mogok ruby are GIA, Lotus Gemology, SSEF, and Gübelin — the four labs whose origin and treatment determinations carry the strongest weight at international auction. GRS and AGL reports are also accepted. Every Skyjems Mogok ruby ships with the original lab letter; the cert ID is exposed in the Product JSON-LD on the product page.

Can I commission a bespoke setting around a Mogok pigeon-blood ruby?

Yes. Skyjems' bespoke programme is gem-first: select the certified Mogok stone, then design a setting in platinum or 18K gold with David Saad. CAD renderings are provided before any metal is cut; lead time is typically 4–8 weeks. Contact the curator at +1-416-366-3335 or [book a private viewing](https://skyjems.ca/pages/schedule-a-private-viewing).

ENCYCLOPEDIA · DAVID SAAD · SKYJEMS

Mogok Ruby — The Pigeon Blood Standard

Name: Skyjems
Address: 27 Queen St East, Suite 1011, Toronto, ON, M5C 2M6, CA
Telephone: +1-416-366-3335
Price range: $$$$

Key concepts: mogok, pigeon blood, burma ruby, origin premium

The term "pigeon blood" refers to a saturated, slightly purplish red colour found almost exclusively in rubies from the Mogok Stone Tract of upper Burma. It is the benchmark every other ruby is graded against.

What the term actually means

Pigeon blood describes a colour with three coexisting properties: pure red hue, medium-to-medium-dark tone, and vivid saturation under daylight. It is not the darkest red; it is the most luminous one.

Why Mogok produces it

The Mogok valley is a marble-hosted ruby deposit, formed about 25 million years ago. The marble host rock is unusually low in iron, which is why Mogok rubies fluoresce strongly under UV — and that fluorescence is what makes the colour appear lit-from-within rather than merely dark.