Jordanna has recently received a Tag Jewellery making kit from Interplay. This set is part of the My Style kits which includes similar sets and all aimed at girls between 8-12 years.
Adding the black string to make a necklace was also pretty easy. It helps to make sure the initial hole in the clay is large enough as it will shrink in the oven.
This kit costs about £12.99 and should be available in many good toy stores. It is surprisingly easy to do.