10.24 Ct. Greenish Blue Aquamarine from Brazil

I am pleased to present a remarkable example of fine aquamarine, a transparent 10.24 carat cushion shape gemstone, measuring 16.17 x 13.67 x 7.04 mm. This stone is faceted in a mixed brilliant cut, combining the scintillation of brilliant facets with the elegant color performance of step facets, and it is finished to an excellent polish. The color is a pleasing greenish blue with light color intensity, a tone that speaks to the classic aquamarine aesthetic while offering exceptional versatility in design. Clarity is graded as very very slightly included, evaluated at eye level, which for the educated buyer means inclusions are minute and do not interfere with the gem s transparency or its light return when set. The gem is heat treated, a standard and stable enhancement in aquamarine that refines blue tones while being widely accepted in reputable trade when fully disclosed. Origin is Brazil, a source known for producing large, clean aquamarines with attractive hues, and this provenance is an important part of the stone s character and value.

From a gemological perspective, aquamarine belongs to the beryl family, chemical formula Be3Al2Si6O18, and it offers a combination of beauty and durability that makes it desirable for wearable jewelry. Typical refractive index values for aquamarine range from 1.577 to 1.583, with low birefringence near 0.005 to 0.009, and a Mohs hardness of about 7.5 to 8, which gives reliable resistance to everyday wear when properly set and cared for. The cushion shape of this specimen allows for a generous face up area, and the stone s proportions yield an approximate 47 percent depth, which enhances its visual presence on the finger or in a pendant. The mixed brilliant cutting style has been chosen to maximize both color and brilliance, so the viewer sees a lively play of light as well as a clean, even distribution of the greenish blue hue. Excellent polish ensures crisp facet junctions and bright reflections, attributes that trained buyers look for when assessing cut quality.

Ethical sourcing is central to how we present this aquamarine at The Natural Gemstone Company. The gem was mined in Brazil under supply chain conditions that we trace through documented channels, and we work with local cooperatives and vetted suppliers who adhere to best practices for worker safety and community benefit. We require disclosure of mining origin and processing steps for every stone we handle, and our procurement policies emphasize compliance with responsible sourcing principles, including avoidance of child labor and support for fair wages. Heat treatment in this instance was performed in controlled facilities, with full disclosure to buyers, and the treatment is considered stable and permanent. For buyers who require independent verification, we can facilitate third party gemological reporting and provide origin statements and documentation upon request, because transparency is essential to the ethical collector.

For the conscious collector who values provenance as well as aesthetics, this 10.24 carat aquamarine represents an especially attractive proposition. Large, eye clean aquamarines with a delicate greenish blue tone and excellent polish are relatively uncommon on the market, and their appeal increases for collectors who prioritize traceability and responsible sourcing. The stone is well suited to be the centerpiece of a bespoke design, whether set as a solitaire pendant to showcase its generous face up area, or as a statement ring where protective gallery work will preserve the gem s integrity during daily wear. Care is straightforward, using warm soapy water and a soft brush for cleaning, and avoiding prolonged exposure to strong heat and harsh chemicals preserves the gem s color and finish. At The Natural Gemstone Company we stand behind our gemstones with detailed knowledge and documented provenance, and we welcome the opportunity to provide additional gemological information, imagery, and certification to support an informed purchase decision.