0.42 Ct. Blue Sapphire from Madagascar

This listing describes a single transparent, round shaped blue sapphire weighing 0.42 carat, with precise dimensions of 4.20 by 4.21 by 3.03 millimeters. The stone is cut in a mixed brilliant configuration, combining a brilliant facet arrangement on the crown with a complementary pavilion design intended to balance brilliance and color. The clarity is graded as very slightly included when evaluated at eye level, indicating that the stone presents with very good visual purity for everyday wear, while the surface displays an excellent polish that enhances luster and surface reflection. The color intensity is classified as light, producing a delicate, cool blue hue that is evenly distributed across the table and crown facets. This sapphire has undergone heat treatment, a stable and widely accepted enhancement, applied to improve tone and clarity, and it is sourced from Madagascar, a region known for producing sapphires with refined pastel and cornflower tones.

The mixed brilliant cut of this gem is an important determinant of its optical performance, and the proportions in this case favor light return and color saturation. With an average diameter close to 4.205 millimeters and a depth of 3.03 millimeters, the proportional relationship yields a moderately deep pavilion, which moderates brightness while concentrating color, particularly when viewed face up. The excellent polish contributes to crisp facet junctions and minimal surface diffusion of light, so reflections appear clean and defined. The very slightly included clarity means that inclusions do not substantially interrupt the path of light through the stone at typical viewing distances, and under magnification the internal characteristics are consistent with natural formation and do not detract from visual appeal.

Light behavior in this sapphire varies predictably with different lighting environments, and the mixed brilliant cut ensures a versatile presentation. In strong daylight, including indirect northern light, the sapphire displays its truest cool blue tone, with even color distribution and lively, well defined facet reflections. The higher energy and broad spectrum of daylight accentuate contrast between lighter and darker facets, producing a pleasing balance of brilliance and depth. Under cool white LED or high color rendering artificial light, the stone maintains color fidelity and presents controlled scintillation, with flashes of pale blue that emphasize the clarity and facet symmetry. Under warm incandescent lighting the tone reads slightly softer, with overall warmth tending to reduce perceived saturation and produce a gentler, more subdued blue. Because corundum has lower dispersion than diamond, colored flashes take the form of blue scintillation rather than pronounced spectral fire, so in candlelight and lower intensity lighting the sapphire presents focused flashes of color and mirror like reflections from the crown facets rather than rainbow flashes.

Practical considerations for setting and daily wear follow directly from these characteristics. The stone is well suited to designs where a restrained, elegant blue is desired, and the mixed brilliant cut is forgiving in both bezel and prong settings due to its balanced light return and depth. The very slightly included clarity and transparent nature mean the gem will read clean to the eye in most mounting styles, while the excellent polish ensures consistent surface brilliance against reflective metal. The heat treatment is a stable enhancement that improves long term appearance when basic care guidelines are followed, and the Madagascan origin provides provenance that is appreciated by connoisseurs for its characteristic pastel tonality. The Natural Sapphire Company presents this piece with clear, technical description to assist in evaluation and design planning, and the combination of cut, clarity, and polish yield a subtle, versatile blue that performs dependably across lighting conditions.