In the context of jewelry, the number “375” refers to the purity of gold. Specifically, it indicates that the piece is made of 375 parts gold out of 1,000 parts total metal. This means that the jewelry is composed of 37.5% gold and 62.5% other metals, such as copper or silver, which are often added to enhance the strength and durability of the piece.
Jewelry marked with “375” is commonly known as 9-karat gold (or 9K), as karat is a measurement used to describe the purity of gold, with 24-karat gold being pure gold. Therefore, 9K gold is considered to be lower in gold content compared to 14K (58.3% gold) or 18K (75% gold) gold jewelry.
This marking is especially prevalent in the UK and some other countries, where gold purity standards are commonly used to indicate the quality and value of gold items.