If I can scratch glass with my stone, does that mean that I have a diamond?

If I can scratch glass with my stone, does that mean that I have a diamond?

John Cordova (Vice President of Human Resources, Robbins Bros.) gives expert video advice on: How do you tell if you have a treated diamond?; If I can scratch glass with my stone, does that mean that I have a diamond?; How can I tell a diamond from a fake using a newspaper? and more...

Traditionally and in the old days you'd scratch a piece of glass with a stone, and if it did you thought it was a diamond. The fact is that there are other stones other than diamond that will scratch glass. You really can't tell for sure whether your diamond is a real diamond or not just by simply scratching glass.