5.40 Ct. Star Tourmaline from Brazil

This listing presents a single, beautiful translucent green star tourmaline weighing 5.40 carats, offered by The Natural Gemstone Company. The gem is fashioned into an oval cabochon with measurements of 11.34 by 9.24 by 6.19 millimeters, displaying an elegant domed profile that optimizes asterism. Color is a true intense green, evenly distributed across the stone, and the cabochon cut is specifically chosen to reveal the star effect. The surface exhibits an excellent polish, which enhances the stone s luster and allows the star to glide crisply across the dome as the stone is moved under light. Photos and face up appearance confirm that this is a classic star tourmaline specimen, with translucency that balances depth of color and light transmission in a way that pleases both collectors and designers for high end jewelry.

Clarity is graded as slightly included, evaluated at eye level, which is typical and often desirable for star stones. The inclusions that give rise to asterism in tourmaline are normally fine parallel needle like or acicular inclusions, oriented within the crystal structure, and they produce the characteristic star or chatoyant band when the stone is cut as a cabochon. In this specimen the inclusions are well oriented to produce a distinct, centered star that is visible without magnification under direct light, while remaining modest in visibility at typical viewing distances, hence the slightly included grade. An educated buyer will appreciate that these internal features are not flaws in the same sense as random fractures, they are structural contributors to the gem s visual phenomenon, and their presence can enhance desirability rather than detract from it. The excellent polish and proportional dome height, supported by the 6.19 millimeter profile, are important for a strong, well defined star, and this piece meets those practical cutting criteria.

Origin is Brazil, a source long respected for producing tourmalines with saturated colors and stable crystal habit. Brazilian star tourmalines are known for quality color and well formed inclusion patterns that respond favorably to skilled cabochon cutting. Importantly for valuation, this stone is reported as having no enhancement, which means no heat treatment, diffusion, or filling has been applied to alter color or clarity. Untreated provenance increases confidence for collectors and investors, because natural color and natural asterism are key drivers of long term value. From a gemological perspective, the combination of intense natural green color, adequate size at 5.40 carats, and a clean, centered star effect is relatively uncommon among star tourmalines, which makes this specimen noteworthy for museums, advanced private collections, or bespoke jewelry houses seeking a natural centerpiece that communicates authenticity and geological interest.

For a buyer evaluating this green star tourmaline, the practical advantages are clear. The size and weight make it suitable as a focal stone in rings, pendants, or bespoke brooches where the cabochon profile can be set to showcase the star under directional light. The clarity grade, when understood in context, explains the origin of the star and confirms that the inclusions are oriented and stable, so the optical effect will remain consistent. The excellent polish and balanced proportions indicate skilled cutting, which preserves weight while maximizing optical performance. The Natural Gemstone Company stands behind the description and is available to provide additional high resolution images, viewing video under light to demonstrate asterism, and independent laboratory documentation upon request. For clients who place a premium on natural, untreated material with demonstrable gemological features, this green star tourmaline represents a technically and aesthetically compelling acquisition.