Watermelon tourmaline is a specific variety of multicolor tourmaline that displays a distinctive pink center surrounded by green outer zones, creating a cross-sectional appearance that remarkably resembles a slice of watermelon when properly cut. This extraordinary gemstone forms when the chemical composition changes during crystal growth, with manganese creating the pink core and iron or chromium producing the green rim, resulting in one of nature's most charming and recognizable color combinations. The best watermelon tourmaline specimens show sharp, well-defined color boundaries with vibrant pink hearts and rich green edges, making them highly prized by collectors and jewelry enthusiasts.
- Color range: Pink to red centers with green outer zones; finest specimens show vivid pink hearts with emerald-like green rims and clear boundaries
- Sizes: Available from small accent stones (5-7mm) to large collector specimens (15+ carats); larger stones better showcase the watermelon effect
- Shapes: Best cut as slices perpendicular to the crystal's length to reveal the watermelon pattern; oval and cushion cuts are most popular
- Origin: Primarily Brazil, Afghanistan, Madagascar, and Maine; Brazilian material often produces the most vivid and well-defined color zoning
- Hardness: 7 to 7.5 on Mohs scale, excellent durability suitable for all jewelry applications including daily wear pieces
- Clarity: Generally eye-clean to slightly included; minor inclusions are acceptable when color zoning is exceptional
- Cutting orientation: Must be cut perpendicular to the crystal's c-axis to properly display the concentric color zones
- Market value: Premium prices for stones with sharp color boundaries, intense pink centers, and vivid green outer zones
