16.68 Ct. Cabochon Turquoise from Persia(Iran)

This specimen is a single, round shape, opaque turquoise, weighing 16.68 carats, with precise dimensions of 17.82 by 17.81 by 8.43 millimeters. The stone is cut as a cabochon, exhibiting a substantial dome with a height to diameter ratio of approximately 47 percent, which produces a strong, classical form and maximizes color display. Color is a medium intense blue with an even distribution across the table and sides, lacking significant dark matrix or webbing, which is characteristic of high quality Persian material. The surface shows an excellent polish, reflecting light evenly with minimal surface undulation, indicating careful final finishing. There are natural internal characteristics consistent with untreated turquoise, and this piece has received no enhancement, stabilized treatment, dye, resin, or other modifications. Origin is Persia, Iran, and the provenance aligns with the classical Neyshabur style of turquoise, known for saturated robin egg tones and structural stability relative to other sources.

From a lapidary perspective, the cabochon demonstrates superior workmanship in both preform symmetry and final shaping. The near perfect circular outline and the well centered apex indicate precise girdle preparation during the initial preforming stage. The dome was achieved by progressive shaping through coarse to fine abrasives, likely beginning with 220 grit for silhouette definition, followed by 400 and 600 grit for contour refinement, and finishing with 1200 and 3000 grit for surface smoothing prior to polishing. The final luster is consistent with a cerium oxide or tin oxide polish on a soft polishing lap, yielding a uniform specular finish without hairlines or buff marks. Edge rounding is subtle and intentional, tailored for bezel compatibility, and the pavilion termination is smooth, providing secure seat geometry for setting without the need for excessive mounting alteration. Optical uniformity across the table reflects controlled material removal and minimal heat stress during cutting, preserving the intact microstructure of the turquoise.

From a gemological and market viewpoint, Persian turquoise occupies a privileged position, and this untreated example is especially desirable for connoisseurs who value authenticity and lapidary integrity. The medium intense blue is versatile for both classic and contemporary design, and the lack of heavy matrix broadens mounting options, including solitaire bezel, low cup prong setting, or high profile statement bezels. Given the cabochon proportions and weight, the piece reads as substantive on the finger or pendant without appearing oversized, and the dome geometry favors light play and color saturation when viewed from multiple angles. Care recommendations reflect the inherent characteristics of turquoise, which is a hydrated phosphate mineral with moderate hardness, and as such it benefits from avoidance of prolonged exposure to solvents, cosmetics, and acidic environments, and from gentle cleaning with a soft cloth and mild soapy water. At The Natural Gemstone Company we document the natural origin and untreated status of this turquoise, and we are available to provide additional high resolution imagery, lapidary history on request, and bespoke setting recommendations to optimize both aesthetics and structural security.