15.89 Ct. Tourmaline from Mozambique

This watermelon tourmaline slice from The Natural Gemstone Company is a truly exceptional natural specimen, weighing 15.89 carats, and measuring 21.26 by 18.66 by 4.01 mm, transparent, with a distinct pink core surrounded by a pale green rim. Unlike many mass market tourmalines that are heavily treated or sealed into generic cuts, this slice is unenhanced, with its natural zoning, color distribution, and inner character intact. The clarity is graded slightly included when evaluated at eye level, which is common for natural tourmaline slices and which adds to the gemological interest of the piece rather than detracting from its charm. The polish is excellent, allowing the subtle internal textures to be read easily, and the very light color intensity gives the slice a soft, elegant appearance that photographs beautifully and sits naturally in bespoke settings. Origin Mozambique is significant, because Mozambique tourmalines are known for their clean color separation and for producing fine watermelon patterns, and this example stands out for its balanced proportions and appealing translucency.

Compared to faceted tourmalines and to commercial by the dozen slices, this specimen offers a level of authenticity and visual complexity that many altered stones cannot match. Many competitors sell slices that have been stabilized, dyed, or filled to improve durability or appearance, or which are cut into standard shapes to hide irregularities, and while those options can be useful for costume or low cost applications, they lack the collector appeal and long term value of a genuinely natural, untreated piece. This watermelon slice shows natural growth contours and internal features that verify its origin and formation history, and those features are prized by collectors, designers, and connoisseurs who want a gem with narrative and natural beauty. The slightly included clarity at eye level is a positive attribute in this context, because it confirms the stone has not been heavily processed, and because the inclusions often interact with light in ways that give the center a soft, painterly quality, which many buyers find more attractive than a clinically clear but altered stone.

In terms of use and value, a 15.89 carat slice presents remarkable flexibility, because its size and proportion make it suitable for a wide range of creative applications. Set in a bespoke pendant, it will behave like a miniature watercolour, with the pink heart softly glowing against the lighter rim, and the excellent polish will ensure the stone presents well against skin. For high end designers, the slice can be mounted in an open back bezel or suspended in a modern frame to show off the translucency. For collectors, its unenhanced state and Mozambique provenance enhance its desirability when compared with stones of similar appearance that have been heat treated, irradiated, or otherwise modified. Price wise, untreated larger watermelon tourmalines command premium attention, and yet this piece represents a balanced value, because it offers a rare combination of natural pattern, transparency, and size that is hard to find at similar price points in the wider market. If you have considered purchasing slices that have been stabilized to avoid chipping, you will also appreciate the excellent polish and the fact that the piece can be set with protective design techniques, such as low profile bezels or modern frame mounts, which allow the stone to be enjoyed daily while minimizing risk.

When you purchase from The Natural Gemstone Company you are working with experienced gemologists and sales professionals who prioritize provenance, accurate description, and long term satisfaction. We document the origin as Mozambique, note the n a cut and the very light color intensity, and make it clear that there has been no enhancement, because transparency around treatments and origin matters for long term value and for ethical sourcing. Compared with mass market suppliers, we provide higher resolution images, honest clarity grading at eye level, and curatorial level handling so that the piece you receive will match the description and the photographs. Whether you are a jeweler looking for an unusual focal gem, a private collector building a natural history style collection, or a designer seeking a soft and rare center stone, this 15.89 carat watermelon tourmaline slice is an exceptional option, offering natural beauty, collector appeal, and a distinct advantage over many cheaper, treated alternatives. Contact The Natural Gemstone Company for more detailed viewing options, bespoke mounting advice, and certification guidance, and let us help you secure a unique, natural gemstone that will retain its beauty and story for generations.