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Why laser etched over diamond etched/engraved. Diamond etching leaves a very rough gouge that ruins the beauty of the brushed aluminum and soon the etching will turn black as the bare aluminum oxidizes.
The process we use to produce our laser etched license plates is this: The laser removes only the very thin layer of black paint, leaving a very detailed view of the Beautiful brushed aluminum underneath. A glossy waterproof UV protected clear-coat finish is then applied leaving a very beautiful, very smooth glossy surface that will keep the brushed aluminum from oxidizing.
The end result is that you will have a very durable license plate with the beauty of the brushed aluminum very clearly defined.