15.21 Ct. Cabochon Turquoise from Persia(Iran)

This specimen is a single, opaque, 15.21 carat oval turquoise, presenting with precise dimensions of 15.39 by 13.58 by 10.74 millimeters, presented as a classic cabochon. The form is oval, with a high dome profile that reads as substantial in depth relative to the table dimensions, offering a three dimensional presence that behaves well in both bezel and closed back settings. Color is described and evaluated as medium intense blue, a balanced tone that is vivid without approaching overly saturated ranges, permitting the subtle internal texture and any minor matrix to remain visually accessible. Origin is Persia Iran, and there has been no enhancement applied to this piece, factors that are critical for connoisseurs and collectors who prioritize natural state and provenance. The Natural Gemstone Company presents this turquoise as an example of careful selection from material that displays consistent body color, excellent surface polish, and cabochon geometry executed to lapidary standards suitable for fine jewelry.

From a technical perspective on cut and finish, the cabochon displays a domed profile that suggests a relatively high crown, measured against the given height of 10.74 millimeters. This vertical dimension produces a pleasing dome curvature, which when combined with the oval outline in the plane of 15.39 by 13.58 millimeters, indicates a thoughtful yield from the rough that maximizes color depth while preserving carat weight. The symmetry of the outline is tight, the girdle of the cabochon appears consistently formed, and the apex is centered to optimize optical balance. The surface finish is described as excellent polish, which in turquoise is typically achieved through a graduated sequence of abrasives ending with a fine oxide polish such as cerium oxide or tin oxide depending on the lapidary workflow, and then a final hand buff for optical uniformity. The polish quality here minimizes surface scattering, allowing the medium intense color to appear clean and even under directional lighting, and the absence of high luster flash indicates a true, controlled sheen appropriate for opaque gemstones.

Microstructural and material considerations are important for turquoise, and this item exhibits characteristics consistent with well crystallized microcrystalline structure. Turquoise is a hydrous phosphate of copper and aluminum, and its color arises from copper content producing blue tones. The grade noted as medium intense addresses both hue and saturation, and in this cabochon the blue is uniform with localized slight variation that suggests internal heterogeneity rather than artificial dyeing or stabilization. There is a very fine, subtle vein or thread of slightly deeper blue visible, and a pinpoint of warm brown matrix that reads as natural host rock inclusion, both of which confirm authenticity while contributing to unique character. The gem is opaque, which is typical for high quality stabilizing turquoise from Persian deposits, and this opacity enhances perceived color solidity in jewelry applications. Hardness and stability of turquoise are moderate, so recommendations for setting and care include secure bezel settings to protect edges, avoidance of prolonged exposure to heat, acids, or ultrasonic cleaners, and occasional gentle cleaning with a soft cloth and mild soap solution for maintaining the excellent polish without risk to the internal structure.

In terms of practical use and design guidance, the cabochon dimensions and dome height make this stone highly versatile for bespoke work. For ring designers, the thickness offers protection against impact when set in a deep bezel, while for pendant and brooch work the mass and visual weight will read as a focal element that does not require additional stones to assert presence. Metals that complement the medium intense blue include warm yellow gold which enhances the copper derived hue, as well as sterling or fine silver which provide a cooler contrast and accentuate the sky blue character. For pieces intended for daily wear, a fully enclosed bezel or channel set mount will preserve the cabochon and reduce exposure to chemicals and abrasion. Given that there is no enhancement, this turquoise will age and patinate naturally, and collectors should understand that surface finishes can mellow and that light exposure will not reverse any treatments because none have been applied. The provenance Persia Iran is significant, Persian turquoise has historical prestige for its pure blue tones and fine material quality, and at The Natural Gemstone Company we document source information to assist designers and clients in making informed choices.

For buyers and professionals seeking a natural, well executed Persian turquoise cabochon, this 15.21 carat example offers a rare combination of clean medium blue color, substantial dimensions, and expert lapidary finishing, all without enhancement. The oval shape and concentrated dome height present excellent design flexibility, and the minimal, natural matrix elements provide a fingerprint of origin without distracting from the overall color field. At The Natural Gemstone Company we evaluate each piece for cutting symmetry, surface finish, and color distribution prior to listing, and we can provide additional images under controlled lighting if further inspection is required. For custom commissions or technical questions about setting parameters, recommended bezel depth, or conservation practices for turquoise, our gemological team is available to advise on specifications that will preserve both the structural integrity and the aesthetic of this fine Persian turquoise cabochon.