A silver Arts & Crafts pendant. Hallmarked for Birmingham, sterling silver and the date letter is a little fuzzy but I think it is 1906. In the familiar greens and blue enamels. These were used at the time because they were cheapest to produce but are now synonymous with this period. Only a small pendant 1.75 inch from the ring to the end of the drop.
Will suit a girl or smaller woman. The 15 inch chain with it is probably pewter.