I thought I'd post a picture of one of the one-piece hearts. I cut most of the shape out freehand in a sort of ice cream cone shape- pointed at he bottom and rounded at the top. I then cut a concave slice out of the top edge, creating the 2 lobes of the heart. I then grind into the space with a 1/2 inch and a 1/4 inch bit to get the v shape between the lobes.
I've no idea who makes this beautiful deeply rippled glass. I found a scrap of it in the "junque" bin at the Glass Key, my local stained glass store. The ripples are deep enough for me to really embed the wire hanger so I don't need to solder or drill into the piece.