23.60 ct Ceylon Unheated Blue Sapphire Rough Parcel – 14 pcs Facet Grade from Kalu Ganga, Sri Lanka

Stone Identity & Quality

This parcel consists of 14 Ceylon Natural Unheated Blue Sapphire roughs with a combined weight of 23.60 ct. Individual stones range approximately from 2.35 ct to 1.00 ct and were sourced from Kalu Ganga village around mining in Sri Lanka.

The material is classified as facet-grade natural sapphire rough and retains its unheated condition. Each piece has its own natural shape, depth, internal structure, and potential cutting direction, so professional individual evaluation is recommended rather than estimating the entire parcel from total weight alone.

Color & Visual Characteristics

The parcel displays natural Ceylon blue sapphire color, with differences in tone and color concentration between individual stones.

Under direct and transmitted light, the rough can be examined for transparency, blue color distribution, internal characteristics, and possible cutting orientation. Differences in rough thickness can also influence how strong or light the blue appears before cutting.

The final face-up appearance of any finished gemstone will depend on the natural material together with orientation, facet angles, proportions, and depth selected by the cutter.

Internal & External Features

One particularly useful feature to study in this parcel is the presence of internal feather-like inclusions in some stones.

Before cutting, these inclusions can be examined from multiple directions to understand their position, depth, and relationship to the cleaner areas of the rough. This allows the cutter to determine whether an inclusion can be removed during pre-forming, positioned away from an important facet, or whether the cutting design should be adjusted around it.

The objective is not simply to remove every visible internal characteristic at the expense of excessive weight. Instead, the cutter can identify the clean facet-grade areas and plan each stone individually to achieve a practical balance between clarity, color, dimensions, and recovery.

Natural alluvial surface marks and irregularities should also be considered when estimating usable material.

Cutting, Specimen, or Treatment Potential

These sapphires are intended primarily for professional faceting and custom cutting evaluation.

The 2.35–1.00 ct individual rough sizes provide different possibilities depending on the geometry of each stone. Before choosing an oval, cushion, round, pear, or another design, the cutter should first examine:

position and direction of feather-like inclusions,

clean facet-grade areas,

blue color orientation,

available depth,

natural surface removal requirements, and

expected finished weight and dimensions.

A slightly smaller clean gemstone can sometimes be a better practical result than retaining additional rough weight while leaving an unfavorable inclusion in an important viewing position.

However, no specific finished size, clarity, shape, or recovery should be guaranteed until each rough has been professionally inspected and planned.

These sapphires are presented as natural and unheated, with no heat treatment stated for this parcel.

Source & Ethical Position

Danushka Gems & Minings works closely with Sri Lanka’s gemstone source areas, connecting natural rough material with cutters, dealers, collectors, jewelers, and international gemstone buyers.

This parcel comes from Kalu Ganga village around mining in Sri Lanka. Our approach is to present rough gemstones realistically—including their natural color, treatment status, surface characteristics, internal features, and practical cutting considerations.

For us, responsible rough presentation also means discussing visible inclusions rather than hiding them. Features such as internal feathers can be studied during professional cutting evaluation so buyers better understand both the opportunities and limitations within each natural stone.