6.42 ct Natural Unheated Light-to-Medium Blue Sapphire Rough – Facet Grade Rough with Small Violetish Shift

Stone Identity & Quality

This is a 6.42 ct Natural Unheated Blue Sapphire rough measuring 12.1 × 10.1 × 6.9 mm. Source from Bibilegama village in Sri Lanka. The stone is described as facet-grade rough with a light-to-medium blue color range, slight violetish visual shift, and slightly included internal structure. Its size and depth make it suitable for professional cutting evaluation by gem cutters, dealers, collectors, and gemstone buyers.

Color & Visual Characteristics

The sapphire shows a light-to-medium blue body color with a small violetish shift visible under certain lighting. In cooler light, the stone can appear more blue, while under warmer or direct light, a soft violetish-blue impression may become more noticeable. This should be described as light-dependent visual behavior, not a strong color-change effect. The final face-up color after cutting will depend on orientation, pavilion depth, cutting angles, and how the color is positioned inside the finished stone.

Internal & External Features

This sapphire rough is slightly included, so the internal structure should be studied carefully before cutting. Some natural surface marks and alluvial rough features are visible, which are normal for uncut sapphire material. The stone has useful body depth and a workable rough outline, but inclusion placement, surface removal, and clean area selection must be considered during pre-forming and cutting preparation.

Cutting, Specimen, or Treatment Potential

As facet-grade rough, this sapphire can be studied for a custom faceted gemstone. The 6.9 mm depth gives the cutter room to consider different cutting directions, but the slightly included nature of the rough means planning is important. A balanced cutting approach should consider face-up color, clean area, weight retention, and final shape. No finished weight, color result, or final appearance should be promised before proper physical inspection and cutting study. Custom cutting and certification can be arranged if suitable.

Source & Ethical Position

Danushka Gems & Minings presents natural gemstones with honest evaluation, practical cutting guidance, and transparent communication. This sapphire rough is offered as natural unheated material with a light-to-medium blue color range and small violetish visual shift. Our approach is to help buyers understand the real character of each rough stone, including its color, inclusions, structure, cutting limitations, and transformation potential before making a decision.