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This exceptional, transparent 10.50 carat cushion shape bluish green aquamarine measures 15.72 x 12.98 x 8.47 mm, it is cut with a mixed brilliant pavilion and crown, it is eye clean at standard viewing distance, it shows a light but vivid color intensity, it has an excellent polish, it has no enhancements, and it originates from Ceylon Sri Lanka. At The Natural Gemstone Company we carefully select only stones that combine natural beauty with honest provenance, and this aquamarine is a textbook example of why provenance and integrity matter. Compared with common commercial aquamarines that have been heated or that show visible inclusions, this piece offers a rare combination of size, transparency, and untouched character that makes it an immediate focal point in any high end setting. Its cushion silhouette carries a classic elegance, while its generous dimensions and bright, natural tone bring a modern presence that outclasses many mass market options.

What sets this aquamarine apart from both its peers and other popular gemstones is the way its internal crystal structure interacts with the cutting design to produce extraordinary light performance. Aquamarine is a variety of beryl, a mineral with a tight, orderly hexagonal lattice that minimizes internal light scattering, and because this lattice tends to yield very clean crystals when conditions are right, a well cut stone returns light with purity and brilliance rather than diffusion. The mixed brilliant cut on this cushion form blends the depth and flash of brilliant facets with the broad, elegant planes of step facets, creating a dynamic interaction where light enters, reflects across broad facets, and exits as crisp, lively scintillation. The relatively modest refractive response of beryl compared with higher index gems becomes an advantage here, because the stone needs fewer gimmicks to look alive, and because the low pleochroism and minimal birefringence of fine aquamarine allow the mixed cut to create a single, coherent sparkle instead of splitting light into competing flashes. In plain terms, you see a clear, lively, ocean like brilliance that does not compete with itself, and that differs fundamentally from the muddled flash of poorly cut or heavily included material.

In the marketplace this stone competes very favorably on both quality and value. Large aquamarines with true eye clean clarity and no enhancement are considerably rarer than many buyers assume, especially when they come from Ceylon Sri Lanka, a source celebrated for producing stones with balanced color and excellent crystal quality. Many aquamarines are sold after heat treatment to improve color, which is an acceptable practice when disclosed, but it can inflate the apparent color grade while masking the natural character and resale value. By contrast this untreated gem retains its natural bluish green hue, a color that is softer but more complex than the often intensified blues you see elsewhere, and that will age with steady appeal rather than trending in and out of favor. Compared with emeralds of similar size, it offers far superior durability and clarity for everyday wear, and compared with sapphires or topaz it offers a unique combination of understated color and lively sparkle without the risk of brittle cleavage or intrusive inclusions. For buyers who value authenticity, long term value, and a unique presence on the hand or as a pendant, this aquamarine represents superior long term investment and enjoyment.

We at The Natural Gemstone Company present this aquamarine as a stone that will anchor an heirloom piece or serve as a signature gem for a bespoke commission, and we stand behind its natural origin and the integrity of its measurements and grading. Because of its 15.72 x 12.98 x 8.47 mm dimensions and mixed brilliant cushion cut, it works beautifully in solitaire or halo ring designs, in classic pendant settings that let light play through the pavilion, and in bespoke pieces where the eye clean clarity and excellent polish can be showcased without distraction. If you seek a gemstone that offers a distinct optical personality, a credible, verifiable origin, and a no enhancement guarantee, this Ceylon aquamarine offers those attributes in a size and quality that is uncommon. Contact The Natural Gemstone Company to request high resolution images, custom setting consultation, or certification details, and experience the uniquely coherent, ocean like sparkle that only a natural, expertly cut, untreated aquamarine of this caliber can provide.