4.01 Ct. Ruby from Mozambique

This GRS certified Vivid Red ruby from Mozambique presents as an exceptionally well proportioned oval, weighing 4.01 carats, with precise dimensions of 10.04 by 7.36 by 5.45 millimeters, and a length to width ratio of 1.36, a ratio that preserves classic oval elegance while maintaining optimal light return. The stone has been heat treated, a standard and stable enhancement for rubies, carried out to intensify the chroma and to reduce the visibility of fine silk inclusions. The cut is a mixed brilliant style, combining a brilliant facet arrangement on the crown with a modified step pattern on the pavilion, and this hybrid faceting is executed with excellent polish and careful symmetry. Clarity is graded as very very slightly included evaluated at eye level, a level at which inclusions are minimal and do not interrupt the overall visual performance. The GRS certification accompanies the gem, confirming both the Vivid Red color grade and the Mozambique origin, details that matter to collectors who value provenance and laboratory verified character.

At the heart of this ruby is corundum, a trigonal crystalline structure with a refractive index in the range typical for ruby, and that high refractive index reduces the critical angle for total internal reflection, producing intense internal light confinement, intense brilliance, and a strong contrast between light and dark facet dance. The mixed brilliant cut is engineered to exploit those optical constants, the shallow crown and precisely angled bezel and star facets direct incident light into the pavilion, the stepped pavilion planes act as controlled light channels that return color saturated flashes through the table, and the result is a scintillation pattern that reads both lively and evenly distributed across the oval surface. Chromium as the chromophore produces the vivid red absorption and also contributes to strong dichroism, so viewing along different crystallographic axes yields subtly different red tones, a quality that adds depth and complexity to the face up appearance. The excellent polish enhances microfacet clarity, allowing sharp facet junctions to act as efficient mirrors, and the gem therefore exhibits high apparent brightness, crisp facet delineation, and a finely textured scintillation that separates it from stones with less disciplined cutting or surface finish.

For the knowledgeable buyer the performance characteristics of this 4.01 carat oval are immediately notable, the combination of vivid color intensity and mixed brilliant faceting yields a balance between fire and saturation, with the pavilion architecture preserving chroma while the crown delivers the necessary brilliance to animate the surface. In practical wear the stone projects strong red presence under daylight and artificial lighting, its very very slightly included clarity means that inclusions are largely masked by the interplay of light, and the heat treatment applied is industry standard, stable, and transparent in its effect to the color and clarity. The Natural Ruby Company stands behind the aesthetic and technical attributes recorded on the GRS report, and we can supply detailed imaging and precise facet analysis on request to demonstrate the facet junction quality, symmetry metrics, and light performance under directional illumination. For setters and connoisseurs seeking a ruby that combines scientific optical advantage with artisanal faceting precision, this Mozambique Vivid Red oval is a rare example, an object that reads as both a deeply saturated collector gem and a brilliantly lively center stone when mounted, a gemstone whose crystalline structure and disciplined cutting together produce a sparkle that is distinct, measurable, and consistently compelling.