Rhodium is a platinum group metal. It is an extremely rare and most valuable precious metal, silvery white in colour and with a high shine finish.
Almost all white gold and some silver jewellery is Rhodium plated to give an anti tarnish and silver white colour to the jewellery.
Reapplication is generally needed every 6-12 months depending on the wearer.
Contact with chemicals can decrease life of plating. Avoiding chlorine and hand sanitizer's well wearing your jewellery.