Connoisseurs Precious Jewellery Cleaner Precious Bath For Gold, Platinum, Diamonds & Precious Stones Regularly cleaning jewellery with Connoisseurs Precious Jewellery Cleaner will greatly improve the brilliance of your gold, platinum, diamonds & precious stone jewellery. Polymers in its formula help reduce the appearance of tiny scratches built up in settings over time. Precious Jewellery Cleaner is a good way to clean most metals used in making jewellery today. 8 FL. OZ. (250ml) Dip tray and brush included.