18.20 Ct. Aquamarine from Brazil

This oval 18.20 carat bluish green aquamarine presents precise technical attributes that appeal to connoisseurs and designers alike. The stone measures 19.80 by 14.40 by 8.00 millimeters, producing a depth percentage of approximately 46.8 percent relative to its mean diameter, a proportion that balances light return with face-up spread. Cut as a mixed brilliant, the piece combines a brilliant-style crown with a faceted pavilion designed to maximize scintillation while preserving the oval outline. Facet junctions are crisp and symmetrical, the girdle is consistent and suited for secure seatings, and polish is graded excellent, producing strong facet-to-facet light return and clean windowing. Clarity is described as very slightly included on an eye-level evaluation, meaning any inclusions are minor and do not materially interrupt the stone’s transparency or brilliance. Color intensity is very light with a discernible bluish green tone typical of Brazilian aquamarine, and the material has been heat treated to reduce greenish tones and enhance the attractive icy blue. The treatment is stable and standard for aquamarine, and the gem’s overall proportions and finish reflect careful lapidary control to retain maximum carat weight while achieving optimal optical performance.

For custom jewelry applications the gem’s dimensions and mixed brilliant faceting provide exceptional flexibility. In rings the 19.8 by 14.4 millimeter oval is ideal as a statement center in a low-profile bezel for everyday durability or in a four to six prong setting to maximize light exposure and scintillation. A cathedral or split-shank mounting complements the stone’s length, while a halo of small brilliant diamonds will reinforce perceived size and emphasize scintillation from the mixed cut. For pendants and brooches the stone’s balanced depth and excellent polish translate to strong face-up presence; a rubbed-in collet or tension style will display the gem cleanly, whereas a bezel with open back will protect the pavilion while preserving brilliance. The gem also adapts to asymmetric or east-west orientations for contemporary designs, and pairs well with both cool white metals such as platinum or 18 karat white gold to preserve the icy tone, or with 18 karat yellow gold for an intentional contrast with the bluish green. At The Natural Gemstone Company we can provide custom CAD visualizations, recommended mountings to protect the girdle and crown, and advice on complementary accent stones and metal selections to optimize both aesthetics and long-term wear.