Where Did the Idea of an Engagement Ring Come From?

This guy is calling engagement rings a scam, and I beg to differ!  I think the people who came up with this kind gesture are magnificent!  What does and engagement ring mean to you?  Would you care if your spouse did not propose with a ring?  I try to be subtle and say that I could just live off of love, but in all reality, the ring means so much more.  It simply says I'm taken and I'm committed.  And, yes you can do both of those things without a girls best friend (A diamond), but it just puts the icing on the cake.  Furthermore, I've always said that I wanted rings tattooed on when my husband and I jump the broom one day.  Why?  Because I'm his and he is mine forever.  We have taken the holy oath before God and I'm telling you that nothing can break us apart. Why do people get tattoos anyway?  Because its permanent and serves as a reminder/memorial as to why they got whatever artwork they imprinted on their body anyway.  An engagement ring is the same way!  Its a symbol for so many things!  What are your thoughts?  Let me know!  I'm curious to know what you think about this love notion!