Furrer Jacot of Switzerland design and create this lovely Platinum single 0.75ct diamond ring. (first ring pictured). This ring is available in 18ct white gold, 18ct yellow gold, Palladium and Platinum with any size diamond. contact us for a quote. Total diamond weight: 0.75ct. Width: 3mm Ring Size: available in any size - please enquire Matching diamond band is available - please enquire Since 1858,Schaffhausen-based manufacturer Furrer-Jacot has been specialising in customised engagement, diamond and wedding rings.