With a touch of green and a little bit of sparkle, this tourmaline and lab-grown diamond ring upgrades your everyday collection. Sterling silver with 18k yellow gold plate 4 x 2. 0mm baguette-cut green tourmaline lab-grown diamonds; f colour/vs2 clarity 1/8 ct. T. W. Of lab-grown diamonds available in select sizes only from the whimly by zales collection, available exclusively at zales