Lady's 18K White Gold Gregg Ruth Pearl & Diamond Earrings. Contains: 2 Cultured Pearls. Size: 8mm. 24 Round Brilliant Cut Natural Diamonds. Weight: 1.68cttw. Gregg Ruth Natural Cultured Pearl and Natural Diamond Earrings. The Gregg Ruth organization is very interested in Posterity. Hence, they go through thousands of diamonds during the picking and then each stone is hand-set. These stone have been uniquely set without prongs to create great brilliance. You're buying into Gregg Ruth's passions. They want to make jewelry as good as it can be made. He's attempting to reach the same level as Tiffany's and Van Cleef and Arpels.