4.01 Ct. Ruby from Mozambique

The Natural Ruby Company presents a transparent, GRS certified vivid red ruby, weighing 4.01 carats, cut to a classic cushion outline with dimensions of 10.04 by 7.36 by 5.45 millimeters, exhibiting a mixed brilliant faceting scheme, a clarity grade of very very slightly included, evaluated at eye level, and an excellent polish. The stone originates from Mozambique and has undergone stable heat treatment, a widely accepted enhancement in the trade that improves color uniformity and reduces the visibility of minute inclusions without compromising structural integrity. The measured depth of approximately 62.6 percent relative to the length and width indicates a proportion that balances internal light return with surface face up presence, producing a table to depth relationship that preserves color saturation while allowing lively refraction. The GRS report provides independent verification of the salient gemological attributes, including origin, treatment, and the visual description, supporting provenance and market confidence for collectors and designers.

From a cutting and optical performance perspective, the mixed brilliant strategy employed in this cushion specimen has been executed to emphasize both color saturation and scintillation. The crown has been faceted with a controlled brilliant pattern to create numerous small light catching planes, while the pavilion has been modified to optimize internal reflection pathways, a hybrid approach that enhances uniform red face up color and produces controlled flashes of lighter red and deep garnet tones. The cushion outline, with gently rounded corners, reduces light leakage common to sharper profiles, allowing the stone to read as a vivid, even red across varied lighting conditions. The excellent polish and precise facet junctions increase specular reflection, which is particularly important for corundum where dispersion is modest, and visual appeal is derived primarily from hue, tone, and saturation. The stone is effectively eye clean, meaning that inclusions are minimal to the naked eye, and any identifying crystal inclusions are more readily seen only under high magnification, a combination of clarity and size that is technically significant for rubies in this carat range.

Owning this ruby is an investment in both intrinsic material value and the craft of gem cutting. Vivid red rubies of clean appearance and four carats of weight are rare in the global market, and the Mozambique origin has become increasingly sought after for producing strong saturated hues with attractive body color. The execution of a mixed brilliant cushion brings together traditional proportioning and contemporary faceting techniques, producing a stone that will translate well into a variety of fine jewelry settings while maintaining resale appeal. Corundum is a durable mineral with a Mohs hardness of nine, providing long term wearability, and the heat treatment applied here is stable under normal conditions, which supports durability and predictable trade value. The GRS certification accompanying the stone provides documentation that facilitates secure acquisition, insurance appraisal, and future resale, aspects that experienced purchasers consider essential when assessing investment quality.

The Natural Ruby Company stands ready to assist with technical mounting advice and documentation transfer, ensuring that the gem is set to protect the girdle and to present the face up color to best advantage. Considerations for orientation during setting include aligning the pavilion symmetry to the ring axis to maximize light return and choosing metal color and setting depth to control perceived tone and brilliance. For collectors who value technical detail, this ruby offers a compelling combination of measurable proportions, certified origin, controlled enhancement, and superior cutting and polishing standards. The result is a gemstone that is not only a striking visual statement, but also a carefully documented, technically refined asset that represents an investment in enduring beauty and expert craftsmanship.