White gold's properties vary depending on the metals used and their proportions. As a result, white gold alloys can be used for many different purposes; while a nickel alloy is hard and strong, and, therefore, good for rings and pins, gold–palladium alloys are soft, pliable, and good for white gold gemstone settings, sometimes with other metals, like copper, silver, and platinum, added for weight and durability (although this often requires specialized goldsmiths). The term white gold is used very loosely in the industry to describe karat gold alloys with a whitish hue. It is a common misconception that the color of the rhodium plating, which is seen on many commercial pieces, is actually the color of white gold. The term "white" covers a large spectrum of colors that borders or overlaps pale yellow, tinted brown, and even very pale rose. The jewelry industry often conceals these off-white colors by rhodium plating.