Platinum vs. 18kt White Gold: Understanding the Differences

When choosing the perfect metal for your jewellery, especially for something as significant as an engagement ring or wedding band, it's essential to understand the differences between platinum and 18kt white gold. While both metals offer a appearance, they differ in several key areas, including composition, durability, cost, and maintenance. This guide will delve deeper into these aspects to help you make an informed decision.

In short: Platinum is denser, more durable and stays naturally white, while 18kt white gold is 75% gold alloyed with palladium or nickel and requires rhodium replating every 12-18 months. Expect platinum bands to cost roughly 40-60% more — typically £900-£1,400 versus £550-£900 for the equivalent 18kt white gold setting in 2025. Platinum suits daily-wear engagement rings; 18kt white gold offers a brighter shine at lower cost.

Composition and Appearance

Platinum is a naturally white metal, renowned for its purity. Jewellery made from platinum typically contains 95-98% pure platinum, with the remaining percentage comprising other alloys such as iridium or ruthenium. This high purity level gives platinum its unique, lustrous appearance and hypoallergenic properties, making it an excellent choice for those with sensitive skin.

In contrast, 18kt white gold is an alloy composed of 75% pure gold mixed with other white metals such as palladium, silver, or nickel to enhance its strength and whiteness. To achieve its bright white finish, 18kt white gold is often plated with rhodium, a metal from the platinum family. This plating gives white gold its characteristic shine and helps protect it from tarnish and wear.