Watermelon tourmaline slices nature’s dessert: pink cores wrapped in green rinds within a single crystal — chemistry shifting mid-growth, frozen forever. Brazil and Nigeria produce fine material; hardness 7–7.5. Polished slices and bicolor gems are collected worldwide.Each watermelon tourmaline at GEMIC Institute is natural, certified in our Siem Reap laboratory and filmed so you can judge the exact color transition. Unique stones; worldwide tracked shipping, 30-day returns.