[edit: finally got some better pictures that aren't blurry and show off a bit more detail.]
Anyway, the tiny glass bottle is only about 1 1/4" tall. I had the mouse bones left over from another project (no I don't harm animals! you can find mouse bones intact in owl droppings.) I wanted to display them, so here you go. I also added 2 5mm swarovski faceted crystal beads in siam and light siam - when the sun hits them, they almost look like pretty drops of blood.
I cut the chain long, then used a hot safety pin to make a hole in the top of the stopper. I added a bit of hot glue on the underneath of the plug, and put my eye screw through the hole and let the glue dry. Put on a jump ring, and put it on the chain, added a barrel clasp to close it.