Inherited mystery jewelry from Great Aunt

My Great, GREAT, aunt passed when I was a baby, she had no heirs, so it all came to us. There were some incredible antiques in there, but because she had Alzheimer's, she quarreled it all over every random place. We just pay for a storage locker and every few months we go dig for treasure.

Tonight I found (in a box of tissues) three of what I thought were brooches, but brooches don't usually come in threes. Upon examining the inside, there was no where for a pink to affix to.

The concave interiors actually had small loops all over them. Could they be hair decorations?