Why Choose White Gold? White gold engagement rings are rhodium plated to brighten the otherwise buttery-tone of the gold. This process needs to be repeated throughout the lifespan of the ring, to maintain its bright, silvery tone. Whilst white gold takes more effort to maintain than other metal types, the metal certainly has its beauty, and works well to brighten diamond engagement rings. White gold is made up of alloys that are less expensive than platinum, meaning it can be a marginally more cost-effective choice. That being said, the cost of re-plating the rhodium, which wears away over time, will mean costs will accrue over time.