Beautiful Calla! That is on my "list" to do someday. I've seen that put into a locket and then, you can wear it around your neck (on a silk or leather strand). My quilt store sells the lockets, but sometimes you can find 1 or 2 at Michaels. Here's the information if you are interested:
michaels.com/beadlanding
BEAD LANDING - Found Objects - Frame
Here are some other numbers on the card:
180755 85821-2014-12
4 00100 83566 1
It is the 1" square.
Have fun