What does 18K gold with 18K gold diamond rings mean?

It can be understood literally as a 18K gold ring inlaid with diamonds, and 18K gold is a alloy with a gold content of at least 75%. Because 18K gold has the advantages of strong ductility and high hardness, it is often used for jewelry design. 18K gold marks are generally the words AU750, 18K or G750.
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national standard GB11887-89 regulations, each opening (English Carat, German Karat abbreviation, often writing "K") gold content is 4.166%. For national standards):
8k = 8*4.166%= 33.328%(333 ‰)
9k = 9*4.166%= 37.494%(375 ‰)
10k = 10*4.166%= 41.660%(41.660% 417 ‰)
12k = 12*4.166%= 49.992%(500 ‰)
14k = 14*4.166%= 58.324%(583 ‰)
18K = 18*4.166%= 74.998%(750 ‰ (750 ‰ )
20K = 20*4.166%= 83.320%(833 ‰) White 18K gold
500x500 34k jpg
21k = 21*4.166%= 87.486%(875 ‰)
22K = 22*4.1666666 %= 91.652%(916 ‰)
24k = 24*4.166%= 99.984%(999 ‰)
24k Kim is considered a pure gold and became "1000 ‰", but the actual gold content was 99.99%, folded, and folded, folded, and folded, folded, folded, folded, folded, folded, folded, folded, folded, folded, folded, folded, folded, folded, folded, folded, folded, folded, folded, folded, folded, folded, folded, folded, folded, folded, folded, folded, folded, folded, folded, folded, folded, folded, folded, folded, folding, folded, folded, folding, folded, folding, folding, folding, folding, folding, folding, folding, folding It is 23.988k.18k gold is gold with a purity greater than 75%.