0.75 Ct. Alexandrite from Ceylon (Sri Lanka)

This listing describes a transparent alexandrite of 0.75 carat in a marquise outline, presenting classical proportions and a refined mixed brilliant cut. The stone measures 7.64 by 4.10 by 3.21 millimeters, and it carries a clarity grade described as very slightly included when evaluated at eye level, a designation that reflects small, unobtrusive inclusions that do not materially affect the gem's transparency or scintillation. Color is one of the defining attributes of this specimen, with an intense greenish to pinkish color change that is characteristic of alexandrite and indicative of strong pleochroic and dichroic behavior. The polish is excellent, contributing to crisp facet junctions and lively return of light across the table and crown facets, and no enhancement has been applied to this stone. The material is gem quality from Ceylon, Sri Lanka, and this origin is consistent with the combination of clarity, hue, and saturation that this piece exhibits. The Natural Gemstone Company documents origin and enhancement status as part of our standard description, and this alexandrite is presented without treatments or modifications.

The mixed brilliant cut combines a faceting scheme that enhances both face up brilliance and depth of color, with a crown and pavilion design that encourages dynamic flashes of light and a pleasing balance between fire and saturation. Alexandrite is a variety of chrysoberyl, and its physical and optical parameters are consistent with high stability and longevity. Typical refractive index values for chrysoberyl fall in a narrow range, and specific gravity values indicate a dense, durable crystal lattice, attributes that contribute to its lively appearance and resilience in jewelry. The very slightly included clarity means that under typical viewing conditions the inclusions remain minor, they do not concentrate in the table or along the pointed ends of this marquise, and they do not interfere with the color change phenomenon that gives this gem its appeal. The cut and polish quality further minimize the visual impact of inclusions and maximize light return, which results in an intense, evenly distributed color when viewed face up in natural and artificial lighting.

When assessed on the Mohs scale of mineral hardness, alexandrite ranks at approximately 8.5, placing it well above common gem materials such as quartz which is rated at 7, and above topaz which is rated at 8, while remaining slightly below corundum varieties such as sapphire which are rated at 9, and of course below diamond at 10. This relative hardness indicates strong resistance to scratching in everyday wear, and it supports suitability for a variety of jewelry settings including rings, pendants, and earrings. The marquise outline carries pointed terminations, and while the material itself is hard and durable, the points are more exposed to mechanical impact than rounded profiles, therefore a protective setting that secures the terminations is recommended to reduce risk of chipping. Cleaning may be conducted safely with warm water, a mild detergent, and a soft brush, and caution is advisable with aggressive treatments or extreme thermal shocks. For customers seeking a refined, natural alexandrite with clear documentation and no enhancement, this 0.75 carat marquise from Ceylon offers a combination of strong color change, excellent polish, careful cutting, and physical properties that support everyday use when set with appropriate protection. The Natural Gemstone Company is available to provide additional images, measurements, and viewing guidance to assist in evaluation and selection.