Necklace for sweetheart neckline

No sweetheart neckline - but I think small pendants/pearl/diamond would look sooo elegant with a sweetheart neckline. Nothing huge but simple and just enough to draw your eye to the neckline!

I bought a necklace like this from Etsy. I thought it was really pretty, complimented the patterning on my dress, and paired well with the bling-y parts of my dress. I usually like having a necklace if there's a lot of open chest showing.