The same as gold filled, but usually of lower quality. This cannot be called sterling. Sometimes it is only temporary due to the person's internal chemistry from a stressful situation, food or medicine that was recently ingested. Silver and zinc tend to give gold its green color, Copper - Red and Nickel its white color. Avoirdupois is the system of weights using the pound of 16 ounces.
Troy weight is the system of weights used for gold or silver with twelve ounces to the pound.