Burmese Blue Sapphire 1.03ct | Untreated | Mogok Origin | UK

A 1.03ct natural untreated blue sapphire from Mogok, Myanmar — untreated with slight inclusions. Just over the 1ct mark, with a 5.7 × 5.3mm face-up and a clean Mogok origin. No heat treatment. Sapphire's hardness of 9 makes it the most durable of the commonly set coloured gemstones, and the untreated status eliminates one of the most common concerns in sapphire purchasing.

Product Details

• Colour: Blue
• Weight: 1.03ct
• Origin: Mogok, Myanmar
• Clarity: Slight Inclusions (AA)
• Dimensions: 5.7 × 5.3 × 4.2mm
• Mineral: Natural Sapphire (Corundum)
• Hardness: 9 (Mohs scale)
• Treatments: None
• Product Code: J004

Our Clarity Grading

• AAA+: Loupe-clean
• AAA: Eye-clean (no inclusions visible to the naked eye)
• AA: Slight inclusions
• A: Moderate inclusions

Why Untreated Mogok Sapphire?

The 1ct threshold in untreated Mogok blue sapphire is commercially significant — stones below 1ct are more readily available; above it, the supply of genuinely untreated natural blue from Mogok thins quickly. This stone crosses that threshold cleanly at 1.03ct, with a Mogok origin, no treatment, and a practical face-up size. For jewellers sourcing a blue centrepiece for an engagement ring or bespoke commission, an untreated Mogok sapphire at this size offers a credible, transparent, and durable choice that customers can understand and value.

About Natural Spinel Gem

We specialise in natural untreated spinel, sourced directly from small-scale miners in Mogok, Myanmar — one of the world's most celebrated gem origins. Gemstones are hand-cut locally. All gemstones are available for private viewing across London at your business premises or by appointment at Hatton Garden.