21.20 Ct. Violetish Blue Tanzanite from Tanzania

This exceptional tanzanite from The Natural Gemstone Company is a transparent 21.20 carat pear shape, with precise dimensions of 23.76 by 14.29 by 9.87 millimeters, presented in a mixed brilliant cut that balances fire and depth beautifully. The stone displays a vivid color intensity, a violetish blue that is highly sought after among collectors and connoisseurs, and it has been evaluated as eye clean at normal viewing distance, indicating no inclusions visible to the unaided eye. The polish is excellent, allowing facets to meet with crisp lines and surface finish that maximizes light return. This tanzanite has been heat treated, a standard and stable enhancement for tanzanite that transforms the natural zoisite tones into the saturated blue violet commonly preferred in the market, and its origin is Tanzania, the only modern commercial source for gem quality tanzanite, which further underpins its desirability and provenance. At 21.20 carats this is a rare size for tanzanite, especially with vivid saturation and eye clean clarity, making it a standout piece for a high end custom commission or a focused collector investment.

From a gemological and grading perspective, several attributes contribute directly to this stone's value and appeal to an educated buyer. The mixed brilliant cut typically features a brilliant facet arrangement on the crown combined with a step or modified pavilion, an approach that yields both scintillation and depth, while helping to preserve weight and stability in a pear shape that measures approximately one point six six in length to width ratio, an elegant proportion for pendants and rings. The clarity grade of eye clean is meaningful because tanzanite often shows internal features at larger sizes, and finding an eye clean specimen over twenty carats is uncommon. The vivid color intensity is a primary value driver for tanzanite, and the stone shows the deep, saturated violetish blue that commands premium pricing relative to lighter or more brownish material. The excellent polish enhances optical performance, and the fact that the stone has been heat treated should be understood as both industry standard and stable under normal wear and care, it does not detract from value when disclosed and expected by the market. For buyers seeking to certify this gem, we recommend independent laboratory grading and documentation to confirm weight, dimensions, cut style, color description, clarity evaluation, and reported enhancements, which supports long term value retention and insurability.

When considering a custom piece, this tanzanite offers abundant design possibilities that play to its color, size, and pear silhouette. For a classic and elegant look, surround the tanzanite with a halo of fine white round brilliant diamonds, their high dispersion and scintillation will frame the violetish blue, increase perceived size, and enhance brilliance. For a striking chromatic contrast that appeals to sophisticated palettes, pair the center stone with vivid green tsavorite garnets or green sapphires as side stones or a petite pavé accent, the complementary green will intensify the blue violet through contrast, creating a lively, modern aesthetic. For a romantic palette, consider small pink sapphires or spinels flanking the tanzanite, the soft pink will warm the composition and emphasize the violet overtones. Metal choice also influences perception of color, with platinum or 18 karat white gold lending a cool backdrop that emphasizes the blue, while 18 karat rose gold introduces a gentle warmth that can accentuate the violet notes for a richer, more vintage character.

In practical design terms, a prong setting that secures the tip and shoulder of the pear profile will maximize light entry and return, while a partial or full bezel can provide extra protection for daily wear and create a contemporary silhouette. For a ring, tapered baguette or trapezoid diamond shoulders will lend architectural balance to the elongated pear, a three stone composition with graduated gems will maintain visual flow. As a pendant, an open back mounting will allow maximum light to pass through the 9.87 millimeter depth, revealing the stone s full tri chromatic potential under different angles. For earrings, matched smaller tanzanites or paired diamonds will create coordinated suites. The Natural Gemstone Company can assist with technical specifications such as prong thickness, setting clearance, and complementary stone sizes to ensure metal and accent choices preserve the integrity of this 21.20 carat tanzanite, while achieving the aesthetic and durability goals of a bespoke piece.