Jewelry skills return?

I've been thinking about picking up my clay again and making more jewelry. A good friend recently lost her job and we've been talking about getting together to craft and make money, possibly starting our own business if it works out. I've been thinking more and more that we could really make some money off of jewelry and that it would be a great starter craft for her since she doesn't sew or crochet, yet. I love teaching others how to craft so this is going to be so much fun. I made a bunch of stuff years ago and have since donated it all to my beloved forum- Carolina Mommas, for an auction they had a couple of years ago to make money for the site. I was surprised at how everyone was bidding quickly on my work and how well it sold. I saved one necklace that I just couldn't bare to part with. Here is a picture:

Every time I see this necklace I wonder if I can do it again. Guess I'll never know if I don't give it a shot! I wonder how long clay is good for?