| Weight | 7.15 ct |
|---|---|
| Dimensions | 13.8 × 10.4 × 6.2 mm |
| Grade | Facet Grade |
| Variety | Sapphire Rough |
| Treatment | unheated |
| Mining Location | Ratnapura village around mining in Sri Lanka |
7.15 ct Facet Grade Ceylon Blue Zoning Sapphire Rough – Ratnapura Sri Lanka
Stone Identity & Quality
This natural sapphire rough weighs 7.15 carats and measures approximately 13.8 × 10.4 × 6.2 mm. The stone originates from Ratnapura village around mining in Sri Lanka, one of the world’s most recognized sapphire-producing regions. It is classified as facet-grade rough, suitable for lapidary cutting depending on orientation and design approach.
Color & Visual Characteristics
The sapphire displays a striking blue zoning pattern. Deep blue color concentrations appear within the crystal structure while lighter zones surround these areas, producing a visually dynamic appearance. Such zoning is a natural feature that forms during the growth of the corundum crystal and often adds unique character to the stone.
Internal & External Features
Externally, the stone shows typical alluvial textures created during its journey through gem-bearing gravels. Internally, the crystal structure reveals natural zoning patterns, minor inclusions, and transparent areas that help determine optimal cutting orientation. These features are valuable for lapidaries when planning how to maximize color appearance in the final gemstone.
Cutting & Treatment Potential
Because the stone contains strong blue zoning, the orientation during cutting becomes especially important. By positioning the stone correctly, a cutter may concentrate the strongest color areas toward the face of the gem. This process helps balance color and brightness in the finished stone while preserving natural material. The sapphire is currently unheated.
Source & Ethical Position
The sapphire was sourced from Ratnapura village around mining in Sri Lanka, a region internationally known as the “City of Gems.” Sri Lankan sapphires are prized for their natural formation history and the variety of colors and patterns found within the island’s gem deposits.
Frequently Asked Questions
Yes, this is a natural Ceylon sapphire rough from Sri Lanka.
No. The sapphire is currently unheated.
Blue zoning refers to natural color concentrations that form during crystal growth inside the stone.
Yes, it is considered facet grade and suitable for lapidary cutting.
Zoning can influence the final color appearance, depending on how the stone is oriented during cutting.
