Mogok sapphire

Mogok (or Burma) sapphires come from the Mogok Stone Tract in northern Myanmar — the same gem region that produces top Mogok rubies. The deposits have been worked for centuries; modern production continues at smaller scale than the historical peak but remains an active source of top-quality material. Mogok blue sapphires sit one tier below Kashmir at the top of the sapphire market.

The signature color is royal blue — vivid saturation, medium-dark tone, slight violet modifier — distinct from the muted cornflower-blue velvet of Kashmir. Mogok geology produces low-iron crystal, which suppresses the brownish modifier that higher-iron sources (Australia, Thailand) show; the result is a crisp, deeply-saturated blue. The finest Mogok material rivals Kashmir on color while showing different character — crisper, more saturated, less velvety.

Mogok origin is determined by LA-ICP-MS chemistry and inclusion fingerprinting. The trace-element signature — low iron, distinctive titanium/gallium/vanadium ratios — distinguishes Mogok from Kashmir, Ceylon, Madagascar, and other sources. SSEF, Gübelin, AGL, and GRS all maintain Mogok reference populations and issue Mogok origin calls reliably.

The pricing is tier-dependent. Investment-grade 3 ct+ unheated Mogok blue sapphires with Gübelin or SSEF paper trade $10,000 to $40,000 per carat in 2026; exceptional 5 ct+ stones at auction have reached $60,000 per carat. The market accepts royal-blue color calls on Mogok material at full premium when paper supports them.

Heat treatment on Mogok material is common at commercial grades but less common at top grades because the geology often produces enough native color that heating is not required. Investment-grade Mogok is overwhelmingly unheated; commercial-grade Mogok is overwhelmingly heated. The heating discount on a Mogok royal-blue runs 40% to 60% at investment-grade quality.

The Burma name is the trade-historical label; the country is now Myanmar but the trade-vocabulary retained "Burma" throughout the political transition. SSEF and Gübelin reports use "Burma" or "Myanmar (Burma)" interchangeably; AGL and GRS use "Burma" most commonly. The trade-recognised origin call is Mogok specifically — sapphires from other Burmese deposits (Mong Hsu, less commonly cited) are called separately.

US import restrictions on Burmese gemstones have applied at various points since 2008 under sanctions related to the Myanmar political situation. As of 2026 the rules remain complex; established Mogok stones with pre-sanction provenance and recent SSEF/Gübelin paper trade freely, but new import of Mogok material into the US is restricted. The supply impact is real and contributes to the Mogok premium in the US market.