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Stolen diamonds can all too easily be sold on to unsuspecting buyers. So to
help establish the real owner, Gersan of Liechtenstein has found a way to
engrave their name onto jewels without without spoiling their appearance (GB
2361671). First, the gem is coated with a fine layer of gold. It is then mounted
in a vacuum chamber where the gold layer acts as an electrode that attracts a
high-energy beam of charged ions. The beam can be steered to write the person’s
name. Molten potassium nitrate is then used to remove the gold coating, leaving
the diamond surface…