9.88 ct Ceylon Blue Sapphire Young Geuda Rough – Unheated Facet Grade from Endana, Sri Lanka

Stone Identity & Quality

This is a 9.88 ct natural Ceylon blue sapphire rough measuring 11.3 × 10.7 × 9.4 mm, sourced from Endana village around mining in Sri Lanka.

The stone is currently unheated and is classified in the local Sri Lankan trade as young geuda. It is a facet-grade alluvial rough with a naturally rounded outline and useful depth for professional cutting evaluation.

“Young geuda” is a trade description used for certain sapphire materials showing characteristics that may make them candidates for heat treatment. It is not a separate mineral species. The stone remains natural corundum and should be evaluated individually before any cutting or treatment decision is made.

Color & Visual Characteristics

In its present untreated state, the sapphire shows a pastel to medium blue tone.

The color becomes easier to understand when the rough is observed through different directions and under transmitted light. Because the stone has substantial depth, its apparent tone may vary depending on viewing direction, lighting intensity and orientation.

The alluvial form has naturally softened the outer surface, while the internal blue body appearance remains visible through the rough.

Internal & External Features

The stone retains its natural alluvial surface, rounded outline and visible internal features.

Before cutting, a professional examination should consider:

– color distribution

– transparent and more included directions

– internal zoning

– surface cavities or natural marks

– usable depth

– orientation for maximum practical yield

– potential response to treatment

The dimensions provide good physical depth, but final clarity and cutting recovery cannot be determined from dimensions alone.

Cutting or Treatment Potential

This sapphire presents two possible paths.

The first is to retain it as a natural unheated sapphire and cut it according to the existing pastel-to-medium blue body appearance. This option may appeal to buyers who specifically prefer untreated Ceylon sapphire.

The second is to evaluate it for professional heat treatment.

For generations, selected geuda and young-geuda sapphire material has been heated in Sri Lanka to improve commercially desirable properties such as color or transparency. Modern treatment may use controlled furnaces and carefully selected heating conditions.

Heating can affect color centers, inclusions and internal structural features. In suitable corundum, this can sometimes deepen blue color, reduce certain cloudy appearances, or change the overall visual character.

However, not every young-geuda sapphire responds positively.

The result can depend on:

– trace-element chemistry

– iron and titanium distribution

– internal inclusions

– zoning

– oxygen conditions

– temperature

– duration

– cooling process

– pre-existing structural characteristics

For that reason, Danushka Gems & Minings does not guarantee any specific heating outcome.

The decision to keep this stone natural and unheated or to attempt treatment should be made according to the customer’s intended market and final use.

Source & Ethical Position

Danushka Gems & Minings works directly around Sri Lanka’s gemstone-producing areas, sourcing rough through miners, mine owners, local buyers and established source dealers.

Our approach is based on practical evaluation and transparent disclosure.

If a stone is currently unheated, we state it as unheated. If it is being considered for heat treatment, we describe that as treatment potential, not as a promised result.

This allows cutters, dealers, jewelers and collectors to make their own decision based on the real characteristics of the rough.