15.56 Ct. Cabochon Ruby from Tanzania

Introducing a truly exceptional gem from The Natural Ruby Company, a GRS certified, untreated red ruby weighing 15.56 carats, presented in a classic oval cabochon shape, with precise dimensions of 15.52 x 12.85 x 7.78 millimeters. This stone is opaque with a vivid red color intensity, graded Lab Color Classification red by GRS, and it carries a clarity grade of slightly included, evaluated at eye level. The cabochon cut enhances the depth and evenness of the rich red tone, while the excellent polish creates a smooth, lustrous dome that reflects light with a soft, velvety sheen. Importantly for collectors and connoisseurs, this ruby is natural and untreated, with no enhancement reported, and its origin is Tanzania, a source increasingly admired for producing strong, richly colored rubies. The GRS certificate provides independent confirmation of the gem attributes, and we include full documentation from The Natural Ruby Company so you can buy with confidence.

Visually this ruby presents a captivating, saturated red that reads consistently across the surface, offering a full, sumptuous appearance ideal for a statement piece. The cabochon form allows the color to play across the dome, producing a luxurious, almost velour finish that is not dependent on facet reflections, which makes the stone wearable and versatile in design. Slight inclusions are present, characteristic of natural rubies of this scale, however they do not detract from the overall color or visual impact when viewed in typical jewelry settings. The substantial size gives this ruby presence and makes it suitable for an array of settings, from an elegant solitaire pendant to a bold ring or a bespoke brooch. Because it is untreated, the ruby carries a premium relative to similar looking stones that have been heat treated or otherwise enhanced, making it an attractive option for both aesthetic enjoyment and long term collection value.

From a value and rarity perspective, a 15.56 carat untreated ruby of vivid red color, with a cabochon cut and documented Tanzanian origin, occupies a special place in the market. Large natural rubies without enhancement are uncommon, and their appeal extends to collectors, custom jewelers, and clients seeking meaningful pieces that retain their natural story. The slightly included clarity is consistent with many high quality natural specimens, and those internal characteristics serve as an assurance of authenticity, rather than a detriment, because they testify to the gem s natural formation. GRS certification reinforces this provenance and provides an independent laboratory record that supports appraisal, insurance, and resale. For design, the cabochon shape and substantial depth lend themselves to protective settings like bezels that emphasize the stone s smooth top, while low profile mounts can be used for rings intended for more frequent wear. This piece is particularly well suited to classic, elegant designs that showcase its color and size, or to custom work where the gem becomes the undiluted centerpiece.

Care and presentation details are straightforward yet important to preserve the beauty of this fine ruby. Given its untreated nature and slight internal characteristics, we recommend gentle cleaning with warm, soapy water and a soft brush, rinsing thoroughly and drying with a clean cloth, avoiding harsh chemicals and abrupt temperature changes that could stress internal inclusions. Ultrasonic cleaning or steam cleaning is not recommended without first consulting a qualified jeweler who can examine the stone in hand, because untreated gems with internal features may react differently to aggressive cleaning methods. The Natural Ruby Company stands behind this ruby with full GRS documentation, professional photography on request, and assistance arranging secure insured shipping. If you would like additional high resolution images, a short video showing the stone under different lighting, or guidance on mounting and setting options, we are ready to assist. Contact The Natural Ruby Company to discuss price, custom design possibilities, and secure purchase arrangements, we would be delighted to help you make this rare Tanzanian ruby the centerpiece of your next creation.