0.78 Ct. Blue Sapphire from Ceylon (Sri Lanka)

This transparent 0.78 carat round blue sapphire measures 5.40 by 5.34 by 3.58 millimeters and presents a depth ratio of approximately 66.7 percent, proportions that are consistent with a mixed brilliant approach to maximize color saturation and return. The faceting combines a brilliant style crown with precise star and kite facets and a pavilion executed to balance face up brilliance with deep color, creating a lively play of light without sacrificing the vivid blue intensity. Clarity is evaluated as eye clean at typical viewing distances, permitting an unencumbered window into the stone and allowing the vivid saturation to read immediately face up. The sapphire is heat treated, the standard enhancement that stabilizes and enriches hue while maintaining natural origin characteristics, and the polish is graded excellent, producing crisp facet junctions and sharp facet reflections. Origin is identified as Ceylon Sri Lanka, a provenance known for producing sapphires with lively blue hues often carrying a subtle violet tone, and at The Natural Sapphire Company we document both the enhancement and origin so you have a full technical profile for appraisal and insurance.

Optically the stone demonstrates strong color saturation with minimal banding or zoning, the mixed brilliant design producing a central star of light and evenly distributed brilliance across the table and crown facets. The slightly deeper pavilion promotes rich body color when set in higher white metal profiles, while still permitting sparkle through the crown due to the well executed crown facet geometry. Typical pleochroic behavior in corundum shows as a dominant blue and a secondary, cooler blue violet when viewed off axis, which in this specimen is subdued by the even cutting and consistent facet alignment. The eye clean clarity grade indicates the absence of inclusions that would interfere with light transmission, allowing the polish quality to be fully appreciated and ensuring tight symmetry in girdle thickness and facet junctions. For a lapidary minded client the mixed brilliant format will register as a deliberate choice to trade a marginal increase in depth for a significant gain in chroma and perceived saturation, a characteristic often sought by collectors and custom jewelers aiming for an intense face up blue.

When planning a custom setting, consider metal and accent stone choices that either contrast or reinforce the sapphire body color depending on design intent. For maximum contrast and an appearance of greater depth and saturation, white platinum or 18 karat white gold settings with a fine halo of brilliant cut white diamonds will enhance apparent sparkle and lift the vivid blue, a classic approach for a solitaire halo ring or pendant. If warmth and a vintage aesthetic are desired, 18 karat yellow gold will introduce a complementary warmth that can subtly shift the perceived tone toward royal blue, while a rose gold bezel will pick up any violet nuance in the stone and create a contemporary color dialogue. Accent stones may be selected to play with color relationships, for example very small round white diamonds sized 1.3 to 1.6 millimeters for pavé halos, tapered baguette or trapeze diamonds for side accents in three stone settings, or paired colored sapphires such as small cornflower blue or pink sapphires to create a graduated color composition. Technical setting notes include allowing adequate pavilion access for light entry in prong settings, considering a low profile bezel with open back where security is paramount but light return is still required, and tailoring prong placement to avoid covering the table or crown facets to preserve the mixed brilliant optical effect. At The Natural Sapphire Company we can provide exacting measurements and multiple imaging angles to your jeweler so the final CAD and setting work can be executed with minimal adjustment, ensuring that the 0.78 carat Ceylon sapphire sits optimally to show its vivid color and excellent polish in any custom design.