I picked this succulent up without a tag recently. It is still very small but I did a little research and it looks like a crassula rupestris or a crassula perforata or the Crossbreed they call "baby necklace". Does anyone have more experience to help me ID this plant?

Yes, it's a Crassula. Likely C. perforata. 'Rupestris' has even thicker, plumper leaves. At least mine do.

Looks like String of Buttons (Crassula perforata) to me too!

For comparison, one photo in the database of Baby's Necklace (Crassula perforata 'Giant Pagoda')