Welcome to Kooheji Jewellery, this tool can only be used on mobile phones.You can access it by scanning the QR code.
This tool helps you find the size of a ring. It uses the size of a credit card as a reference.
To measure accuratley place your phone on a flat surface to look straight on it.
Place card inside the frame, and adjust the size until both the card and the frame are the same size.
Place a ring on the circle and line up the inside of the band so that you can see the black outline inside.
US Size 7 UK Size N