8.00 Ct. Bi Color Tourmaline from Mozambique

This 8.00 carat transparent bi color tourmaline from Mozambique, presented by The Natural Gemstone Company, is precisely fashioned in an emerald cut with faceted step style, measuring 14.98 x 7.84 x 7.18 mm. The cutting emphasizes long parallel facets that produce a strong color striping from green to rich brown, with intense color intensity and excellent polish that yields crisp facet junctions and mirror like facet surfaces. Clarity is graded slightly included at eye level, which is typical for natural elbaite tourmalines and contributes to the gem character without materially affecting light transmission. The stone has been heat treated to enhance and stabilize the brown and green saturation, a standard and disclosed enhancement that improves color balance while preserving the gem's natural zoning pattern.

From an optical and material perspective this tourmaline displays properties consistent with high quality elbaite, with refractive index values typical of the species, and measurable birefringence that can produce subtle internal light separation along the length of the emerald cut, reinforcing the visual separation of the two hues. Specific gravity and other physical constants align with tourmaline family minerals, delivering a solid feel and good heft in hand. The excellent polish maximizes brilliance from the step cut, while the length to width ratio and depth are optimized for broad color presentation rather than extreme windowing, making the gem ideal for design placements that showcase the bi color effect along its long axis.

On the Mohs scale the hardness of tourmaline is approximately 7 to 7.5, which provides good daily wear durability that is superior to softer gem materials, and comparable or slightly harder than common quartz which is at 7. Tourmaline is less hard than corundum varieties such as sapphire and ruby which are at 9, and substantially less hard than diamond at 10, therefore protective setting choices are recommended for rings or bracelets where impact risk is higher. For longevity we advise protective bezel settings or secure prong designs, routine cleaning with warm soapy water and a soft brush, avoiding strong heat, steam cleaning, and aggressive chemicals to preserve the heat treated color stability. The Natural Gemstone Company stands behind the gem provenance and cutting quality, and can advise on setting options that best display the bi color transition while safeguarding the stone for regular wear.