Pure gold is 24 carats. 22 carats is 91.6% ie 22/24.
Another method of describing gold is by the Fineness, which is given in parts per 1000, hence 916.6 for 22 carat.
I assume 91.3% is a typo.
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If metal is 10 percent gold, it is an alloy in the proportion of 1/10 gold and 9/10 some other metal (usually silver).
58.5%
18K Gold: 18K Gold is 18/24ths, or three-quarters pure gold. Jewelry of this fineness is marked "18k" or "750," meaning 75 percent gold."
Well it containes gold copper and either zinc, mercury, or silver?
The initials K.P. when found on a piece of gold jewelry indicate that the piece of jewelry is not one hundred percent gold, but only plated with gold. K.P. stands for "karat plate."