Sterling silver is an alloy of silver containing 92.5% by mass of silver and usually 7.5% by mass of copper. The sterling silver standard has a minimum fineness of 925.The sterling alloy originated in continental Europe and was being used for commerce as early as the 12th century in the area that is now northern Germany. William Henry uses the latest state-of-the-art casting equipment to create mesmerizing pieces that are often considered par with our hand-carved work.