What does MCI stamped in inside band of a ring also stamped 14k mean?

MCI stamped inside the band of a ring typically stands for the manufacturer or jeweler who made the ring. The 14k stamp indicates that the ring is made of 14 karat gold, meaning it is 58.5% pure gold. The combination of MCI and 14k suggests that the ring was made by the MCI manufacturer using 14 karat gold.