If you want the most durable karat gold, look for gold purity levels that are low such as 12k or 10k gold. These karats have less gold, but you will be shocked by how long they last. They are strong, meaning they last for an extended period. You could also choose 14k as it is colorful with the yellow gold color and exceptionally durable. Avoid the 18k gold since it is expensive but not as durable as the rest. The gold karat is easily damaged.