4.05 Ct. Ruby from Mozambique

This C.Dunaigre certified red ruby from Mozambique, offered by The Natural Ruby Company, is a rare transparent example weighing 4.05 carats, with exact dimensions of 5.01 by 4.90 by 2.56 millimeters, presented in a cushion shape with a mixed brilliant cut. The mixed brilliant cut optimizes both face up brilliance and depth of color, combining the scintillation of brilliant facets with the depth and color concentration from a slightly stepped pavilion. The gem has a vivid color intensity, which in ruby grading terminology refers to a highly saturated red hue that is evenly distributed throughout the stone. The clarity is graded as very slightly included at eye level, indicating that inclusions are minimal and do not significantly interrupt the visual flow or the passage of light through the stone, and the polish is excellent, which enhances facet definition and surface reflection.

From a gemological perspective, this ruby exhibits characteristics that educated buyers use to differentiate superior stones. As a natural, untreated ruby with no enhancement, it retains its original color and internal structure without the influence of heat or other treatments, which is a premium attribute in the market. The very slightly included clarity means that the stone transmits light efficiently, producing clean flashes and a lively face up appearance. The excellent polish ensures that light is returned to the viewer with minimal surface diffusion, accentuating the vivid red and contributing to a velvety inner glow. The cushion shape, coupled with the mixed brilliant cut, balances depth and surface area, making the red appear both saturated and radiant in various lighting conditions.

In terms of reflective qualities and optical performance, this Mozambican ruby performs in ways distinct from other gemstones commonly considered in the same high value category. As a corundum, it shares the crystalline properties typical of rubies and sapphires, including a vitreous luster and a refractive index that produces strong light return. Compared to spinel, which can display excellent brilliance but has a slightly lower refractive index, this ruby tends to show a richer and warmer red return with greater apparent depth. Compared to garnet types that may display strong color but often less lively scintillation, the mixed brilliant facet arrangement in this ruby produces sharper flashes and more dynamic scintillation. Relative to diamonds, which exhibit very high dispersion and a characteristic white light fire, rubies offer more color driven reflections, with less spectral dispersion but a stronger emphasis on saturation and hue. The absence of enhancement in this specimen means that the stone’s reflective behavior is wholly natural, showing the true manner in which light interacts with its inclusions and crystal lattice, often resulting in a more organic and desirable interplay of red flashes and internal glow.

For discerning buyers evaluating investment grade or bespoke jewelry gemstones, this ruby represents a combination of desirable traits. The certification from C.Dunaigre provides documented authenticity, and the combination of a substantial 4.05 carat weight, vivid natural color, very slightly included clarity at eye level, and excellent polish positions the stone above many treated or lower clarity alternatives in both aesthetic and market terms. The Mozambique origin is important because this region has produced some of the most vibrant and well colored rubies in recent decades, known for their deep saturated tones. When set in a well designed mounting that allows light to enter and escape, the cushion mixed brilliant cut will maximize both face up color and scintillation. Buyers who prioritize natural provenance, stable long term value, and visual performance will find this ruby an exceptional choice, and The Natural Ruby Company stands ready to provide further technical data, sourcing history, and setting recommendations to ensure that this gem meets both aesthetic and investment expectations.