5.38 Ct. Blue Aquamarine from Brazil

This is a finely proportioned, transparent 5.38 carat cushion shape blue aquamarine, dimensions 13.16 x 11.49 x 6.03 mm, cut in a faceted mixed brilliant style, clarity graded as eye clean at normal viewing distance, color intensity described as medium, polish graded excellent, enhancement by controlled heat treatment, and origin documented as Brazil by The Natural Gemstone Company. The combination of a substantially broad pavilion and a slightly elongated cushion outline yields a length to width ratio of approximately 1.15, producing a commanding face up presence without appearing overly elongated. The geometric relationship between the 6.03 mm depth and the mean girdle span of 12.33 mm produces a depth percentage of about 48.9 percent, which is within the range that balances ideal light return with measured color saturation for beryls. The 5.38 carat weight carried in these dimensions gives the stone a strong visual mass, allowing facet junctions and table proportion to influence both the blue saturation and the apparent transparency when mounted. As delivered, the stone shows a clean table, sharp facet junctions, and no eye visible inclusions, which preserves brightness while allowing the medium color to read consistently across the table.

The mixed brilliant cutting strategy applied to this cushion aquamarine marries a brilliant style crown with a pavilion that favors larger step like facets, a configuration chosen to amplify both brilliance and strong color delivery. The crown retains a controlled table and closely calibrated crown angles, which promote scintillation and return of blue light, while the pavilion faceting pattern floats broader facets that reinforce evenness of tone and minimize windowing. This approach yields a lively balance between lively flash and stable color, making the face up blue appear uniform rather than patchy under typical lighting. Excellent polish throughout the facet set ensures minimal light leakage at facet junctions, enhancing both perceived transparency and facet contrast. The eye clean clarity at standard inspection distance allows the cutter to prioritize facet geometry and color placement rather than concealment of inclusions, resulting in crisp facet planes and evenly distributed color saturation. The documented heat treatment is a standard, stable enhancement for aquamarine, applied to reduce residual green undertones and to refine the blue hue, without compromising the gem's structural integrity or long term stability.

Colorwise this Brazilian aquamarine occupies a true medium blue field with a subtle blue green bias removed by treatment, offering a cooler, more neutral tonic blue than many other regional varieties. When compared to the famed Santa Maria de Itabira material from Minas Gerais in Brazil, which is prized for a deep, velvety cornflower blue and very high saturation, this stone reads a touch lighter and more transparent, trading the ultra deep tone of Santa Maria examples for improved brilliance and a more versatile wearable blue. Against aquamarines from Pakistan and Afghanistan, which often display a strong pure blue that can approach high saturation in larger crystals, this gem is a slightly more restrained medium intensity, chosen for balanced wearability and consistent evenness across the table. Compared with African sources such as Mozambique and Nigeria which frequently show a greener cast at comparable tone levels, the present specimen, after heat treatment, sits cleaner in the blue axis, with less green modulation and a cooler impression similar to higher grade Brazilian aquamarine, albeit at a medium rather than a deep intensity.

For setting and practical considerations this stone benefits from open mounting styles that allow light into the pavilion and the interior of the stone, thereby maximizing the mixed brilliant cut dynamics and preserving the eye clean aesthetic. The cushion shape and medium color intensity are well complemented by white metals that emphasize the cooler blue, such as rhodium finished 18 karat white gold or platinum, while yellow gold will warm the overall appearance and can be chosen intentionally to create a softer, vintage character. Because the gem is eye clean and has excellent polish, prong or four corner bezel designs are both suitable, with prongs allowing the most brilliance and bezel work offering greater security without significant sacrifice to face up color. The Natural Gemstone Company discloses the heat treatment, and stands behind origin and treatment reporting, offering additional documentation on request, along with bespoke mounting consultation to position the piece for both technical performance and aesthetic goals. If you value a stone that combines a measured, medium blue tone, precise mixed brilliant faceting, and the provenance of Brazilian material, this 5.38 carat cushion aquamarine is engineered to deliver durable wearability and refined optical character.