When a gold piece of jewelry is stamped with kp, it refers to the amount of the gold. Most people are familiar with a stamp like 10kt, which indicates that the amount of gold in the jewelry is 10kt. However, the amount of gold could actually be rounded up to 10. The p in the kp stamp stands for plumb gold. Plumb gold refers to the actual amount of the gold. So a 10kp gold rind, would be a 10kt gold ring, having exactly 10kt.