750 means 75% puregold the balance of 25% are other metals such as copper and silver. Gold is measured in fractions of 24. As an example Pure gold is 24 parts out of 24 or [24/24=1=100%]. 18 Karat gold (18K) is 18 parts of pure gold out of 24 or 18/24=0.75 or the way it is stamped 750. Pure gold is very soft. The alloy or additives will harden the metal and change the color of the metal.
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