This is fine work done by designers and technicians. They use a variety of craftsmanship to make the ring. Product Information OriginSouth Sea Pearl Processed Jewelry in Japan MaterialWhite South Sea Pearl, 18K Gold, Pink Sapphire and Natural Diamonds DimensionsCustom Pearl Shaped: Round Size: 14-15mm Quality: AAAA Nacre: Very Thick Color: White Luster: Very High Accessories Metal: 18K White Gold Other: 0.65ct of Pink Sapphire and 0.70ct of SI Quality Natural Diamonds