We think the older crystals seemed more brilliant - or perhaps they become that way as they age! We love these tiny vintage glass hearts. We expect that they are from the late 1940s or early 1950s; but they could easily be older.
Each one measures 7mm by 7mm and they are about 3mm in profile. They are flat-backed with gold foil and the front is smooth rather than faceted.
These can be sewn or, more easily, glued on to your project. We are showing several so that you might see the front and back. You may be able to remove the gold backing, but we have not tried to do this.