0.89 Ct. Blue Sapphire from Ceylon (Sri Lanka)

This specimen is a transparent 0.89 carat round blue sapphire, with exact dimensions of 5.77 by 5.76 by 3.24 millimeters, cut in a faceted mixed brilliant style. The measured depth translates to approximately 56.2 percent of the average diameter, a proportionality that sits squarely within an optimal window for mixed cuts to balance internal color saturation with light return. The cutting geometry utilizes a brilliant style crown to promote scintillation and a precision faceted pavilion to enhance return, resulting in lively brilliance and even light distribution across the table. Clarity has been evaluated as very very slightly included at eye level, indicating only minute internal features that do not impair transparency or visual performance to the naked eye, and polish is graded excellent, with crisp facet junctions and a smooth surface finish that maximizes reflectance. Color intensity is described as intense, consistent with a vivid Ceylon blue, and the stone has undergone standard heat treatment, a stable enhancement that improves hue and clarity without compromising the corundum matrix. Origin is Ceylon Sri Lanka, which is known for producing sapphires with a characteristic combination of lively blue tone and strong brilliancy.

From a gemological and lapidary perspective, the mixed brilliant cut on this round sapphire is purposefully calibrated to preserve the intrinsic color properties of Ceylon material while extracting maximum optical performance. The crown facet arrangement is configured to produce multiple small flash patterns that animate the surface as the gem moves, while the pavilion faceting sequence is optimized to channel light back through saturated zones of the crystal, reinforcing the stone s intense blue appearance. The depth proportion at 56.2 percent is particularly effective for this size, as it avoids the excessive light leakage associated with overly shallow cuts, and it prevents the glassy, overly dark effect that can occur with too deep a pavilion. The excellent polish and precise symmetry of the facet architecture promote high contrast between bright and dark facets, enhancing perceived color purity and visual depth. The very very slightly included assessment at eye level implies inclusions are minute and well positioned, typically along crystal growth lines or as tiny mineral inclusions, and these features can serve as a natural fingerprint for long term identification and provenance verification without diminishing the gem s suitability for fine jewelry.

As an heirloom quality gemstone, this 0.89 carat Ceylon sapphire embodies the technical and material attributes that support generational transmission. Corundum s position as a nine on the Mohs hardness scale confers exceptional resistance to abrasion and everyday wear, while the stable nature of heat treatment when properly executed ensures color retention under normal wearing and cleaning conditions. The stone s mixed brilliant proportions and excellent polish mean it will continue to display lively brilliance even when reset or remounted across multiple generations, and the compact yet substantial size makes it versatile for enduring designs, from a classic four prong solitaire to a protective low bezel for high wear pieces, or as a refined center for a three stone or halo mount. Craftsmanship recommendations to maximize longevity include securely proportioned prongs or a slightly raised collet to protect the girdle, precision setting to avoid undue stress during resizing, and routine professional inspections to ensure settings remain secure. At The Natural Sapphire Company we document origin and treatment history as part of our provenance stewardship, and we offer bespoke setting services that apply traditional bench techniques and modern gemological practices to create pieces designed to be enjoyed by successive generations, with the sapphire s optical and physical characteristics preserved and celebrated over time.