There is often confusion between platinum and white gold, mainly because civilians have long referred to platinum (Pt) as "platinum," causing ambiguity among people outside the watch and jewelry industry. For example, China International Airlines' Platinum Card uses the term "Platinum" in English, and the word "platinum" is also commonly used in other contexts.
In the watch and jewelry industry, white gold is an 18-karat alloy containing 75% pure gold (or 750 parts per thousand). The metal added—usually palladium or silver—gives it a white appearance, resulting in a color that closely resembles platinum. Some brands even apply a layer of enamel on the surface to enhance its visual appeal. Therefore, in this industry, white gold is considered a variation of gold, while platinum is a completely different precious metal, unrelated to gold.
When it comes to price, 18-karat white gold tends to be more expensive than other types of 18-karat gold like yellow or rose gold. This is due to the difficulty in casting white gold and the need for rhodium plating to maintain its luster. Platinum, known as the "king of materials" in horology, is almost twice as costly as white gold. While 18-karat white gold contains 750 parts per thousand of gold, platinum in the jewelry industry is typically found at 950 parts per thousand or 900 parts per thousand. This isn't about purity but rather about the functional requirements and the metal's strength.
Interestingly, Patek Philippe is so concerned about customers confusing platinum with white gold that they sometimes place a small diamond at the 6 o'clock position on their platinum or white gold watches to help distinguish them.
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