Catherine Mannheim 18k Yellow Gold Green Tourmaline Diamond Ring A lively green tourmaline carved into a unique shape commands this gorgeous 18 karat yellow gold surround. We love the colour combination and the light satin finish with offset sparkly diamond. This exquisite ring punches well above its weight and would make a gorgeous right hand ring. Mannheim, Rings, Engagements, Diamond Ring, Fine Jewelry Designers, Turquoise Ring, Yellow Gold, Jewellery, Ring