3.19 Ct. Green Tourmaline from Ceylon (Sri Lanka)

This is a beautiful transparent green tourmaline weighing 3.19 carat, cut into an elegant oval measuring 10.84 x 8.76 x 5.33 mm, offered by The Natural Gemstone Company. The gem is faceted with a mixed brilliant cut, combining a brilliant style pavilion with a faceted crown to balance scintillation and color saturation. Clarity is graded as slightly included when evaluated at eye level, which is common and expected for natural tourmalines and does not compromise the stone s overall appeal or structural integrity. Color intensity is dark, producing a deep, saturated green that reads as rich and luxurious under most lighting conditions. The polish is excellent, and there has been no enhancement, so what you receive is a natural, untreated parcel of Ceylon origin, a provenance well respected among collectors for producing fine colored stones.

The structural and optical properties of tourmaline are central to the gem s distinctive sparkle, and this particular piece illustrates those properties exceptionally well. Tourmaline crystallizes in the trigonal system, creating anisotropic optical behavior that produces pronounced pleochroism, so the stone displays slightly different tones of green when viewed from different directions. In combination with a moderately high refractive response and measurable birefringence, these characteristics allow faceted surfaces to separate and reflect light in multiple planes, yielding lively scintillation and subtle color shifts. The mixed brilliant cut enhances these effects by using a precise arrangement of crown facets to capture incident light and a brilliant pavilion geometry to maximize internal reflection and return, producing flashes of light and lively face up brightness despite the stone s dark color intensity. Excellent facet junctions and the superior polish from expert lapidary work further increase light return and make the faceting pattern read cleanly to the eye. For an educated buyer this stone s value is reinforced by its natural, unenhanced origin in Ceylon, its collectible size and shape, and its combination of deep color, intentional cutting, and optical character. The slightly included clarity adds authenticity and does not detract from wearability, making this an outstanding choice for a bespoke ring or a refined collector s cabinet.