Green tourmaline is a variety of the complex borosilicate mineral tourmaline that derives its beautiful green coloration from iron and chromium content within the crystal structure, ranging from pale mint green to deep forest green with exceptional clarity and brilliance. This gemstone encompasses several distinct varieties including chrome tourmaline (colored by chromium) and verdelite (the general term for green tourmaline), each offering unique characteristics and color intensities that make green tourmaline one of the most versatile and sought-after colored gemstones. Green tourmaline's pleochroism often displays different green intensities when viewed from various angles, adding depth and visual interest to properly cut stones.
- Color range: Pale mint green to deep forest green; includes chrome green, blue-green, and yellow-green varieties with varying saturation levels
- Sizes: Available from small accent stones (3-4mm) to large specimens (20+ carats); larger stones often display richer color saturation
- Shapes: Excellent for all cuts including emerald, oval, cushion, round, and pear; brilliant cuts maximize sparkle while step cuts showcase color
- Origin: Brazil, Afghanistan, Madagascar, Nigeria, and Mozambique; each location produces distinctive color characteristics and quality
- Hardness: 7 to 7.5 on Mohs scale, excellent durability for all jewelry applications including daily wear rings and bracelets
- Clarity: Generally very clean with good transparency; eye-clean specimens are readily available in most sizes and qualities
- Pleochroism: Moderate pleochroism showing different green intensities from various viewing angles, adding visual depth and interest
- Treatments: Usually natural and untreated; occasional heating to enhance color clarity, but most material requires no enhancement
