Hi Wendy!
A 10g pack of Art Clay Silver Slow Dry will make 1-3 pendants, depending on the size. I've gotten 6 small flowers, in three sizes, out of a pack to make a pair of earrings.
A 10g pack will easily make a ring. Rings are a little more advanced.....
PRACTICE with polymer clay first (I've always used Sculpey, but Sparklebee mentioned a "mushy" clay that might work, too!)
Looking forward to seeing your creations.