4.00 ct Natural Ceylon Blue Sapphire Rough – Unheated Cushion Potential from Kahawatta, Sri Lanka

Stone Identity & Quality

This is a 4.00 ct natural Ceylon blue sapphire rough measuring 9.4 × 8.3 × 4.7 mm.

The stone is sourced from Kahawatta village around mining in Sri Lanka and is currently unheated.

It is a facet-grade alluvial rough with a naturally rounded form. The overall outline and width-to-length relationship appear particularly suitable for consideration as a cushion-style finished sapphire.

Color & Visual Characteristics

The rough shows a natural blue body appearance.

Because this is uncut material, the visible tone may vary depending on:

– viewing direction

– lighting strength

– transmitted versus reflected light

– surface texture

– final cutting orientation

The natural alluvial skin softens the appearance of the rough, while stronger light helps reveal the internal blue more clearly.

Internal & External Features

The sapphire retains its natural alluvial outline and surface character.

Before cutting, the stone should be checked for:

– internal inclusions

– cleaner directions

– color concentration

– usable pavilion depth

– natural surface depressions

– orientation for the strongest face-up blue

– practical weight retention

The dimensions show a relatively broad shape with moderate depth, which is one reason a cushion direction may be practical.

Cutting Potential

The rough has an appearance that naturally lends itself toward a cushion-style cut.

Rather than forcing a long oval or another elongated design, a cutter could potentially work with the existing width and rounded corners to preserve more material.

However, the final design should still be decided only after close internal examination.

Important considerations include:

– how much depth is available for the pavilion

– the direction of strongest blue color

– whether a more square cushion or slightly rectangular cushion gives better recovery

– how much symmetry can be achieved without unnecessary weight loss

A good cutting plan should balance color, brilliance, symmetry, depth, and finished weight.

No specific recovery percentage or final carat weight is guaranteed before preforming.

Source & Ethical Position

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

Our focus is practical evaluation and transparent presentation.

For rough stones, we prefer to show the real natural form and explain realistic cutting possibilities instead of promising exact finished results before the stone is opened and preformed.

This sapphire is presented as a natural, unheated Ceylon blue sapphire rough with cushion-cutting potential based on its current shape.