It indicates that the pendant was made in Nigeria. The "10K" stamp means that the pendant is made of 10-karat gold. 10-karat gold is an alloy that contains 41.7% gold and 58.3% other metals, usually copper and zinc. It is often referred to as "yellow gold" because of its warm, golden color. "NG10K" means that the pendant is made of 10k gold from Nigeria.
