Burmese Blue Sapphire 0.85ct | Untreated | Mogok Origin | UK

A 0.85ct natural untreated blue sapphire from Mogok, Myanmar — untreated with slight inclusions. A well-proportioned stone at 5.2 × 4.6mm with a confirmed Mogok origin and no heat treatment. At this size and price range, untreated Mogok blue sapphire offers excellent value against comparably sized heated stones from lesser origins.

Product Details

• Colour: Blue
• Weight: 0.85ct
• Origin: Mogok, Myanmar
• Clarity: Slight Inclusions (AA)
• Dimensions: 5.2 × 4.6 × 3.6mm
• Mineral: Natural Sapphire (Corundum)
• Hardness: 9 (Mohs scale)
• Treatments: None
• Product Code: J003

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?

Sub-1ct untreated Mogok blue sapphire represents an accessible entry point into a genuinely premium material category. Sapphire is the hardest of the commonly set coloured gemstones at 9 on the Mohs scale — harder than spinel, tourmaline, and aquamarine — which makes it one of the most practical choices for everyday jewellery use. Untreated natural blue with a Mogok provenance at this size is suitable for earring studs, pendants, and smaller ring commissions where the treatment status and origin matter to the end customer.

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.