Authica Jewellery specializes in lab-grown diamonds. From top to bottom: Devin Nathanael, Iris Tan and Sharon Sim. (PHOTOS: Authica Jewellery) SINGAPORE – Diamonds may be a girl’s best friend, but for Devin Nathanael, the male co-founder of a lab-grown diamond specialist, they were the path to a new venture. Together with his two former colleagues […]