What mean rw on 9k gold?

In the context of jewelry and precious metals, "rw" on 9k gold usually stands for "rose white," indicating that the gold has a specific alloy blend that gives it a rose hue combined with a white finish. This type of gold is often used in jewelry to create a unique aesthetic. The "9k" signifies that the gold is 37.5% pure, as it is made from a mix of gold and other metals.