27.74 Ct. Cabochon Turquoise from USA

This listing presents one opaque blue turquoise cabochon weighing 27.74 carats, round in outline, with precise dimensions of 17.44 by 17.53 by 12.15 millimeters, cabochon cut, medium color intensity, excellent polish, no enhancement, origin United States, offered by The Natural Gemstone Company. The carat weight and dimensional data indicate a substantial example suitable for high profile settings, and the nearly perfect round outline reflects careful preforming and trimming during the cutting process. The designation of opaque reflects the internal structure and light behavior typical of turquoise, and the absence of enhancements confirms that the color and stability are inherent to the material as extracted. The combination of size and natural color without stabilization or dye places this specimen in a distinct category for collectors and designers who prioritize untreated American turquoise.

Color evaluation for this stone falls into the medium intensity band, with a primary hue in the sky blue to robin egg blue range, uniform across the dome with minimal visible matrix or veining. Under standard daylight equivalent illumination the stone exhibits even color distribution, with subtle surface luster derived from the polish rather than any translucency. The spectral and visual response is consistent with turquoise mineralogy, which typically displays refractive indices in the 1.61 to 1.65 range, and specific gravity commonly near 2.6 to 2.9, values that this cabochon conforms to when measured with standard gemological tools. The color saturation is balanced, neither washed nor overly deep, which aids in versatility when pairing with different metal tones and accent gems, and the medium intensity provides a pleasing visual impact without overpowering delicate design elements.

The cabochon execution demonstrates advanced lapidary technique, with a high domed profile of 12.15 millimeters that enhances color depth and provides a pleasing bulk for bezel mounting. The cutter preserved the natural surface continuity, using progressive grit stages to remove saw and grind marks, followed by fine lap polishing likely with tin oxide or cerium oxide to achieve the excellent polish reported. Edge control is precise, the girdle is consistent and free of nicks or chips, and the dome symmetry across the 17.44 and 17.53 millimeter axes is within typical tolerances for hand cutting, indicating careful control of preform rotation and lap pressure. The absence of stabilization treatments means that all cutting decisions were made to conserve thickness and avoid exposing sensitive zones, while still presenting an even convex platform that will sit securely in a bezel or collet setting.

From a provenance and use perspective the American origin adds both market recognition and collector interest, as natural US turquoise is often sought after for its historical and gemological significance. At 27.74 carats and with dimensions that allow for prominent placement, this cabochon is ideal for bespoke rings, statement pendants, and museum quality pieces, particularly when set to protect the stone from abrasion given turquoise hardness in the lower mid range. Recommended mounting approaches include full bezel seats to guard the girdle and sides, or three quarter bezels combined with protective crowns to reduce impact exposure, and practitioners should avoid high tension settings that place point stress on the body of the cabochon. Care instructions include gentle cleaning with a soft cloth and mild soap and water, avoidance of acids, solvents, and ultrasonic or steam cleaners, and storage away from prolonged heat and chemical contact to preserve the natural color and surface integrity. For professional inquiries and to view additional documentation on this untreated American turquoise please contact The Natural Gemstone Company, we can provide gemological data, handling advice, and custom setting recommendations tailored to this particular 27.74 carat blue turquoise.