| Weight | 13.30 ct |
|---|---|
| Dimensions | 15 × 12.3 × 7.3 mm |
| Grade | Facet Grade |
| Variety | Sapphire Rough |
| Treatment | natural and unheated |
13.30 ct Ceylon Natural Blue Sapphire Rough – Unheated Facet Grade Alluvial Sapphire from Ratnapura
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Stone Identity & Quality
This is a 13.30 ct natural blue sapphire rough measuring approximately 15 × 12.3 × 7.3 mm.
The material is classified as facet-grade rough and has an alluvial form, meaning the exterior has been naturally rounded and modified through its geological journey before recovery.
The sapphire is represented as natural and unheated and comes from Ratnapura village around mining in Sri Lanka, one of Sri Lanka’s historically important gem-producing regions.
This piece is offered as potential cutting rough rather than as a finished gemstone, so professional orientation and planning remain important parts of its evaluation.
Color & Visual Characteristics
The rough displays an attractive natural blue sapphire body color.
Its appearance changes somewhat according to lighting, viewing direction and the thickness of the material being observed. Natural daylight gives the most practical impression of the overall blue character, while stronger transmitted illumination helps a cutter examine how light travels through the rough.
Because sapphire is directionally colored, orientation should be considered carefully when deciding how to position the future table and pavilion.
Internal & External Features
The stone retains a naturally water-worn alluvial exterior, including irregular surface textures and depressions typical of rough material.
Close inspection also reveals internal and surface-reaching characteristics that should be taken into account during cutting. These are especially useful to study under transmitted light because strong illumination can reveal features that are less obvious during ordinary daylight viewing.
Rather than hiding these areas, Danushka Gems & Minings photographs rough stones from different angles so buyers and cutters can better understand the material they are evaluating.
Cutting, Specimen, or Treatment Potential
This sapphire is offered as potential facet-grade rough.
Its 15 × 12.3 mm spread and approximately 7.3 mm depth provide a useful starting form for cutting evaluation. However, selecting a finished design should not be based on dimensions alone.
A professional cutter should first study the color orientation, internal structure, surface-reaching features, usable depth and the areas that can be retained without unnecessarily sacrificing weight.
Depending on the internal structure revealed during preforming, the cutter may choose a design that prioritizes color, clarity, spread or weight retention.
No exact finished carat weight is promised because the true recovery becomes clearer only after the first stages of cutting.
The stone is represented as unheated, and no treatment result or color improvement is being promised.
Source & Ethical Position
Danushka Gems & Minings works through direct relationships with Sri Lankan miners, village suppliers and gemstone-source networks.
Our approach to rough gemstones is practical: identify the material, document its origin, examine its natural characteristics and present both its positive features and the areas that require consideration.
For professional buyers, transparency before cutting is more valuable than an unrealistic prediction of the finished result.
Additional inspection, cutting consultation, custom cutting and certification arrangements can be discussed depending on the buyer’s requirements.
Frequently Asked Questions
Yes. It is represented as a natural blue sapphire from Ratnapura village around mining in Sri Lanka.
It weighs 13.30 ct and measures approximately 15 × 12.3 × 7.3 mm.
No. The rough is represented as natural and unheated.
It is classified as facet-grade rough, but professional orientation and preforming are necessary before determining the most suitable finished design.
An exact finished weight cannot responsibly be guaranteed before preforming. Recovery depends on internal features, color orientation, depth and the final cutting design.
