The initial pendant is a well-used design element, and many designers offer them. This one, by Zoe Chicco, is a playful take on a familiar theme. You can pick one initial per pendant, one in textured gold (yellow or rose) and one in similarly brushed sterling silver. They come on a 16″ silver, diamond cut bead chain with a spring ring clasp. Each disc is  approximately ½”.

This sells for USD $298 and there are a lot of other personalized jewellery designs on the site.