4.69 Ct. London Blue Topaz from Brazil

This heart shaped London blue topaz presents a precise combination of proportions and cutting technique, weighing 4.69 carats with dimensions 9.87 by 10.00 by 6.84 millimeters. The gem is executed in a mixed brilliant cut, combining a brilliant-style crown to maximize scintillation with a faceted pavilion designed to return light efficiently through the heart outline. The measured depth of approximately 69 percent sits within the optimal range for mixed cuts, producing a strong face-up presence while maintaining lively return and contrast. Facet junctions are sharp and symmetrical, the cleft and lobes of the heart are well-defined, and the polish is graded excellent, yielding crisp facet reflections and a lively pattern under direct and diffused light. Color is a vivid London blue with a deep, saturated tone and excellent uniformity across the table and pavilion, a result of irradiation enhancement that delivers the characteristic steel-blue to deep-blue range prized in this material.

Clarity is graded very very slightly included on an eye-level assessment, with the stone appearing clean to the unaided eye while minute, diagnostic features become evident under 10x magnification. These microscopic inclusions, including isolated pinpoint crystals and fine, healed feather trajectories associated with natural growth, act as unique identifiers, a fingerprint that confirms natural origin and individual identity rather than detracting from the gem’s visual impact. The inclusions are stable and well-distributed, contributing subtle internal character that refracts light in micro-contrast areas, enhancing the gem’s scintillation rather than obscuring it. Origin is Brazil, and enhancement by irradiation is fully disclosed, a standard and stable treatment for producing the London blue tone; the color is stable in normal wear but should be protected from extreme heat and harsh chemical exposure. This piece from The Natural Gemstone Company is ideally proportioned for a solitaire ring or pendant setting where the heart silhouette and vivid color can be showcased, and its combination of expert cutting, excellent polish, and characterful microscopic inclusions will appeal to collectors and connoisseurs seeking both technical excellence and individual personality in a single gem.