6.00 ct Unheated Ceylon Blue Sapphire Rough – Facet Grade Alluvial Material from Kalawana, Sri Lanka

Stone Identity & Quality

This natural blue sapphire rough weighs 6.00 carats and measures 12.5 × 10 × 5.8 mm. It was sourced from Kalawana village around mining in Sri Lanka, a respected alluvial sapphire-producing area within Sri Lanka’s gem belt. The stone is offered in its natural unheated condition and is classified as facet grade rough, suitable for professional cutting evaluation.

This piece is intended for gemstone buyers, cutters, and dealers who understand that rough sapphire must be judged by structure, internal condition, depth, and orientation rather than by surface appearance alone.

Color & Visual Characteristics

The stone shows a natural blue body color with visible concentration inside the rough. As with many Sri Lankan alluvial sapphires, the external surface appears softer and more diffused than the internal body, which is common before any cutting or polishing begins.

The color appearance may vary depending on light direction, viewing angle, and how the internal blue zones are positioned within the rough. This is one of the reasons sapphire rough must be examined carefully before estimating the final result.

Internal & External Features

Externally, the sapphire retains the rounded and slightly frosted skin typical of alluvial rough recovered from gem-bearing gravels. Natural surface abrasions, skin, and worn contours are expected features in this kind of material.

Internally, the stone shows visible blue concentration and structural areas that suggest cutting interest, but final clarity and openness must always be judged during closer examination. With sapphire rough, zoning, inclusions, and internal transparency can affect both orientation and final yield, so the stone should be evaluated as a cutting material rather than as a finished gem.

Cutting & Treatment Potential

This sapphire is offered as natural unheated rough, allowing the buyer to study the material in its original geological condition. The cutting potential depends on how the internal blue zones, depth, and natural shape are mapped during planning.

Because the stone has a broad body and workable thickness, it may be considered for custom cutting depending on internal structure and yield expectations. No treatment result is assumed or guaranteed. Any future cutting or treatment decisions should be based on direct professional examination of the material.

Source & Ethical Position

This sapphire was sourced from Kalawana village around mining in Sri Lanka through source-connected local gem channels. At Danushka Gems & Minings, we work with natural rough gemstones from Sri Lankan mining regions and present them with clear origin information and realistic structural assessment.

Our approach is based on transparency, geological authenticity, and respect for the material in its natural state before transformation.