16.90 ct Mixed Unheated Ceylon Alluvial Rough Parcel – 13 Natural Sapphires and Spinel from Sri Lanka

Stone Identity & Quality

This 16.90 ct mixed alluvial rough parcel contains 13 natural unheated stones sourced from Kalawana, Nivithigala, and Pelmadulla villages around mining in Sri Lanka. The parcel consists mainly of natural sapphires, with one 0.84 ct orangy-pink spinel, and the remaining pieces all above 1 ct. The average stone size is approximately 1.30 ct, with dimensions varying naturally from piece to piece.

The parcel is classified as facet grade alluvial rough, suitable for individual lapidary evaluation. Because the stones are naturally mixed in color and structure, each piece should be studied separately for its own cutting possibilities and internal balance.

Color & Visual Characteristics

This parcel shows a natural range of Sri Lankan rough colors, with the sapphires presenting cool blue to violet-blue, Yellow, Pink appearances and the single spinel adding a soft orangy-pink contrast. Because the material remains in rough form, color expression varies depending on thickness, angle, and lighting conditions.

The visual interest of the parcel comes not only from color, but also from the way each stone preserves its natural alluvial appearance. This gives a more honest view of the material before any preforming or faceting decisions are made.

Internal & External Features

Externally, the stones show the rounded and slightly worn surface texture associated with alluvial rough from Sri Lanka’s gem-bearing gravels. Natural skin, small abrasions, and softened outlines are expected in this type of material.

Internally, each piece may differ in openness, inclusions, and color concentration. That variation is part of what makes a parcel like this useful for cutters, because it offers multiple structural possibilities within one group rather than a single uniform result.

Cutting & Treatment Potential

This parcel is offered in natural unheated condition, allowing buyers to evaluate the stones in their original form. In rough material like this, cutting potential depends on individual orientation, shape, and internal structure. Some pieces may be better suited for smaller bright stones, while others may offer stronger recovery depending on depth and color placement.

Because the parcel contains mixed sapphire rough and one spinel, treatment expectations should never be generalized across the group. Each stone must be judged separately according to its own natural character and cutting strategy.

Source & Ethical Position

This parcel was sourced from Kalawana, Nivithigala, and Pelmadulla villages around mining in Sri Lanka, through direct connections to traditional source areas. At Danushka Gems & Minings, we value natural rough parcels for their honest representation of origin, structure, and geological character before transformation.

Working close to source helps maintain clearer traceability and supports the connection between mining communities, rough material, and the cutting process that may follow.