What is the difference between rhodium plated white gold and palladium-rich white gold?

Rhodium plated white gold is what is most commonly encountered in high street jewellery shop windows. It is super-white (whiter than platinum). Whilst the colour appeals to some tastes, the plating will eventually wear off in areas which suffer the most abrasion (e.g. the underside) and show through the true colour of the metal. This means it will need replating every few years to keep it looking its best. We use palladium-rich white gold which includes 16% palladium. We like the slightly earthier tone of palladium-rich white gold compared to rhodium plating, and it means our white gold is the same colour all the way through and never needs replating.