4.29 Ct. Cabochon Carnelian from Brazil

This translucent orange carnelian is offered at an exact weight of 4.29 carat, a mass that places it well within the premium size range for cabochon chalcedony specimens, and the dimensions record 10.25 x 10.26 x 5.65 mm, confirming a near perfect round outline with substantial dome height for visual presence. The round shape was cut as a cabochon to maximize color saturation and light diffusion, and the 5.65 mm depth yields a generous cap that enhances the stone body tone and produces a warm internal glow when set in jewelry. In practical terms, 4.29 carat for a 10.25 mm round cabochon is a weight to length ratio that communicates solidity and value, making this carnelian appropriate for centerpiece ring mounts, prominent pendant settings, and museum quality reference collections.

From a lapidary perspective the cabochon demonstrates precise craftsmanship and finish, with an excellent polish that results in a highly reflective surface and minimal surface perturbations. The dome profile shows consistent curvature across the table with symmetrical left to right dimensions at 10.25 mm by 10.26 mm, indicating careful preform shaping and controlled grinder work. Clarity is graded as eye clean at normal viewing distance, and the translucent character allows light to penetrate and scatter through the cryptocrystalline quartz matrix, yielding the vivid color intensity documented. Color evaluation places the hue firmly in the orange range, with tone from medium to slightly strong and saturation described as vivid, attributes that together constitute a premium color grade for dyed carnelian. The cabochon cut was selected over faceting because chalcedony exhibits a diffuse internal structure, and a smooth dome maximizes perceived color uniformity and provides the most aesthetically powerful presentation.

Technical material properties and enhancement disclosure are provided to support accurate valuation and long term care. Carnelian is a variety of microcrystalline quartz with an expected refractive index near 1.530 to 1.540 and a specific gravity around 2.58 to 2.64, and the measured hardness is typically near Mohs 6.5 to 7, which makes it durable for everyday wear when mounted properly. This specimen originates from Brazil, a source known for producing saturated and evenly colored chalcedony material, and the piece has undergone dyeing enhancement, a common and accepted practice for intensifying orange hues in carnelian. The dyeing process used for chalcedony typically involves impregnation with organic or synthetic dyes under controlled heat, and post dye stabilization and polishing create a uniform appearance. Dyeing improves market desirability, but it also requires care, and we recommend avoiding prolonged exposure to aggressive solvents, steam cleaning, and excessive heat cycling to preserve color stability.

Practical recommendations for setting and integration into high quality jewelry are as follows. The 4.29 carat weight and 10.25 mm diameter are ideal for bezel settings that protect the girdle and perimeter while showcasing the substantial dome, and for prong settings a low profile or halo arrangement will secure the cabochon while maintaining exposure to light that emphasizes the vivid orange color. The excellent polish will reduce the need for frequent professional rework, however long term maintenance should include gentle cleaning with mild detergent and warm water, avoiding ultrasonic cleaners and steam baths due to the dye treatment. For designers and collectors who seek contrasting combinations, consider pairing this carnelian with White Opal for a play of warm saturated orange against the cool, translucent to opaque body tone of opal, with the understanding that opal and carnelian have different hardnesses and care protocols. White Opal refers to an opal variety with a pale to light body color and potential play of color, and it typically registers lower on the Mohs scale near 5.5 to 6 and contains a measurable water content that makes consolidation and careful handling important. At The Natural Gemstone Company we document origin and enhancement, and we can assist with matched pairings and mount compatibility to ensure that a White Opal companion stone receives the appropriate protective setting when combined with carnelian.

This specimen represents a combination of measurable technical merit and visual impact that defines premium quality for dyed carnelian cabochons. The 4.29 carat weight is substantial for this gem class and enhances both the perceived and intrinsic value, while the precise dimensions, symmetrical round outline, and substantial dome contribute to a balanced stone that is immediately suitable for high end jewelry settings. The vivid color intensity and eye clean clarity are key value drivers, and the Brazilian origin adds a provenance element that experienced buyers recognize. Buyers seeking lab reports or custom mounting services will find our team at The Natural Gemstone Company available to provide additional technical data and handling recommendations, ensuring that the cabochon maintains its color and polish for many years as a centerpiece in your next design.