7.79 Ct. Bi Color Sapphire Crystal from Ceylon (Sri Lanka)

This listing describes a single semi transparent sapphire weighing 7.79 carats, with dimensions of 19.77 by 6.73 by 4.80 millimeters, presented in a various shape bi color form that highlights natural color zoning. The stone retains a rough crystal cut which preserves much of the original crystal terminations and habit, and yet the surfaces show an excellent polish that enhances luster and hand appeal. The color is classified as medium intense, which in a semi transparent material provides a delicate balance between saturation and light transmission, allowing for interesting internal reflections and color shift depending on light direction. The bi color character is evident along the length of the crystal, a feature that collectors and designers prize because it documents growth conditions within the original pegmatitic or alluvial environment, and offers creative options for oriented cutting or bespoke settings that emphasize the contrast between tones.

From a clarity and gemological point of view the sapphire is graded very slightly included evaluated at eye level, a grade that indicates minor internal features which are visible only to a trained observer under close inspection, and which do not materially affect durability or overall beauty. These inclusions are typical of natural Ceylon material and often take the form of needle like growth features, tiny fluid inclusions, or pinpoint crystals, all of which can actually confirm natural origin when examined under magnification. The semi transparent nature combined with the very slightly included clarity produces pleasing depth without the visual obstruction that heavier inclusions can cause. For an educated buyer, this balance of clarity and natural internal character is valuable because it preserves authenticity, supports provenance, and still allows for significant light return and color appeal when set in a thoughtfully designed mount.

The absence of enhancement is an especially important attribute for discerning purchasers, this sapphire has no heat treatment or other laboratory enhancement, so the color and clarity are entirely natural as formed in Ceylon Sri Lanka. Sri Lankan sapphires have a long established reputation for producing well colored stones with strong pleochroism and interesting zoning, and unenhanced material from this origin commands premium interest among collectors and connoisseurs because it is rare to find larger gems with natural color without treatment. For practical use the stone is robust and suitable for a variety of settings, it can be left in its rough crystal form for a contemporary, museum quality piece, or it can be re cut to maximize one of the color zones depending on the design brief. At The Natural Sapphire Company we provide full disclosure of origin, treatment, and measurements, and we encourage buyers to request independent gemological documentation if desired. For clients seeking an unusual, natural, and ethically sourced Ceylon sapphire this 7.79 carat bi color crystal represents a tangible combination of rarity, historical provenance, and design flexibility that educated buyers will recognize as a long term value proposition.