What makes Burmese ruby different from Mozambique ruby?

Origin signature. Burmese (Mogok) rubies form in low-iron marble host rock, which produces strong UV fluorescence — the lit-from-within character. Mozambique rubies form in iron-rich amphibolite host rock, which suppresses fluorescence. At equivalent colour, the Burmese fluoresces more under daylight. Mozambique rubies are often heat-treated to improve colour; the price gap between top Burmese and top Mozambique reflects the pedigree and supply differential.

Is unheated rare for Burmese ruby specifically?

Very. The majority of commercial Burmese rough is heated to improve clarity and brighten colour. Unheated material above 2 carats with collector-grade colour is structurally rare. Lab letters confirming both Mogok origin and no-heat treatment carry the highest auction weight.

What size threshold defines investment-grade unheated Burmese ruby?

Generally 2 carats and above for serious collector interest, 3 carats and above for institutional or major-auction grade. Below 2 carats, the market is broader and pricing is more accessible. Above 5 carats, supply tightens dramatically and prices step up sharply. Skyjems carries the 0.5–5 carat range in inventory; larger stones are sourced through the curator.

Which lab reports does Skyjems accept for Burmese ruby?

GIA, Lotus Gemology, SSEF, and Gübelin are the four labs whose Burmese ruby determinations carry the strongest weight at international auction. Skyjems' inventory rubies ship with original GIA or Lotus reports as the standard; SSEF and Gübelin reports are also accepted at delivery.

What is 'pigeon blood' on a ruby lab report?

Pigeon blood is a colour grade — vivid, slightly purplish red with high saturation and medium-to-medium-dark tone. GIA, Lotus, and SSEF can include the pigeon-blood designation in the comments line when colour meets the threshold. The grade applies regardless of origin, but is most commonly seen on Mogok stones because of the fluorescence character.

Can I commission a bespoke setting for an unheated Burmese ruby?

Yes. The bespoke programme is gem-first: choose the lab-certified ruby, then David Saad designs the setting in platinum or 18K gold around the stone. Ruby is hard (Mohs 9) and suits any setting style. 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

Unheated Burmese Ruby — Lab-Certified

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

Key concepts: burmese ruby, mogok ruby, unheated ruby, pigeon blood, no heat ruby, gia ruby

An unheated Burmese ruby is the apex of the ruby category. Burma — specifically the Mogok Stone Tract of Upper Myanmar — has produced the world's most celebrated rubies for over 800 years, and the unheated tier represents the smallest, most actively-traded portion of the modern collector market. Skyjems carries 16+ unheated Burmese ruby SKUs, with origin and treatment determination on the lab letter.

Why unheated Burmese ruby commands the apex premium

Three converging factors. (1) Origin — Mogok's marble-hosted, low-iron deposits produce the strongest UV fluorescence in ruby, the lit-from-within pigeon-blood character. (2) Treatment — most commercial rubies (including most Mogok material) are heat-treated to improve clarity and colour; unheated retains the native state. (3) Pedigree — Mogok ruby has been at the centre of the international ruby market since the 14th century. The intersection of all three drives the price premium that records (Christie's Sunrise Ruby) reflect.

Reading the lab report

GIA, Lotus, SSEF, and Gübelin are the four labs whose origin and treatment determinations on Burmese ruby carry weight at international auction. The report should state: variety = ruby, origin = Myanmar (Mogok where supported), treatment = no indications of heating. Skyjems verifies every unheated Burmese listing against the original lab letter.

Five-step evaluation

(1) Lab letter confirms unheated and Mogok-origin (or Burmese where Mogok-specific isn't determined); (2) colour reads vivid red to slightly purplish red, with strong fluorescence under UV; (3) clarity is eye-clean to lightly included — Mogok rubies often show silk inclusions that contribute to fluorescence; (4) cut returns light through the centre; (5) carat weight matches the lab.

Skyjems inventory snapshot

Browse Burmese ruby at /collections/ruby — both unheated and heated tiers represented; treatment disclosed on every listing.

Private viewings and bespoke

Contact Skyjems at +1-416-366-3335 or request a private viewing.