A 750-th white gold ring, set with a large rectangular cushion-cut Paraíba tourmaline weighing approximately 8 ct (natural inclusions, minor scratches), surrounded by seventy-four modern brilliant-cut diamonds (slight lack of material beneath the setting). M. O. French: J. Poisson. L. Tourmaline dimensions: approx. 15.6 x 11.7 x 6.2 mm Estimated total weight of diamonds: 1.40 ct Ring size: 51 Gross weight: 14.7 g Tourmaline certified by the GemParis laboratory. Tourmalines of this type, marketed under the name “Paraiba tourmaline,” do not all originate from Paraiba or Brazil. Mozambique and Nigeria are other possible sources of these stones. These tourmalines may have undergone treatments that are currently undetectable.