Thanks Margo!
You can't automatically focus stack in Photoshop. There is another bit of software that does. Ask Overread. I don't have it handy at the moment.
You could do it in Photoshop, but you will manually line up your layers and then mask them off. Too time consuming.
The earing is a product, and you can't look at it as an artsy photo. I know it's an earring, but I can't see how it works, that bit is all blurred. There isn't enough information for me as a consumer to completely understand this earring. I mean, be artsy with your background, but the viewer must be able to understand the product. Like I said earlier, with my work, and rings in particular, I try to get all the important detail work in focus, but the plain bottom of the ring shank doesn't matter too much so it can blur. The viewer should get lost in the detail of the work and understand it's a ring. Your earring image doesn't show the mechanics of the earring. Very important!
The first pic, there is less importance of the back end. One can assume, and get enough info that the back is more of the same as the front. The problem with that product shot, for me, is that I can't readily tell it's a bracelet or necklace. Granted, your description would tell me. Just some food for thought.