I found this clear, heart shaped neodymium glass in a deep groove of our very corrugated dirt road last year which showed up when I was walking late in the day as sunlight streamed from the west straight down our road, as it does. I am a continual fossicker in my area (grain fields that use to have houses on over 100 years ago, so this was a terrific find! I could hardly believe that it remained glossy and was barely marked even after being buried in the road for decades! I do some silver jewellery sometimes. Neodymium glass is an old style of glass and it can throw gold lights in normal daylight or lamplight, sometimes can show blue lights also. Mine glows gold light.