Gold is an incredibly popular material for high-end watches marred only by its softness (and perhaps price these days). Watch cases in gold are already not pure gold in order for them to have a slightly tougher alloy. But anyone who has worn an 18k gold watch will testify that the material picks up nicks and scratches with incredible ease.
18k gold often has a little "750" stamped in it. This number indicates the percentage of actual gold per 1000 parts in the material. For gold to be 18k it must be 750 parts per 1000 as I understand it. It is logical to ask whether or not magic gold meets this number or is less given the ceramic compounds. According to Hublot, Magic Gold has the same 750 parts per 1000 of gold as 18k gold - thus making it at least as valuable at 18k gold (with the the scratch resistance).
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