Hi Amanda and welcome to PCC (as a non-lurker! <G>). Working with PC sure can be such a lot of fun. Congratulations on having your work displayed in a shop. May you get some good sales there.
One of the things I've observed about photographing necklaces is that if you extend the chain part of necklace out full length you can't really take a picture of the pendant part that's close enough to really show the pendant part they way it deserves. What many people do is to sort of "curl up" the chain part so it's nestled a bit nearer to the pendant. Some people also drape the slightly curled up necklace over some sort of short object. This photo of Linda Landig's jewerly at ArtFire isn't quite what I have in mind because I'd like to see the pendant part photographed a bit closer in "macro" camera setting, but maybe you can get the idea of what I'm trying to describe. I also like the curled up and close up way she photographed the necklace that's furthest to the right in her banner.
Wishing you much delight and joy in your PC journey.
Anita in AZ