What is the carat measurement for gold jewelry containing 75% gold?

The carat measurement of gold jewelry indicates the proportion of pure gold present in the alloy, with 24 carats representing pure gold. When gold jewelry contains 75% gold, it is equivalent to 18 out of 24 parts being pure gold. This ratio translates to an 18-carat rating, as 18 divided by 24 simplifies to 0.75, or 75%.

This means that the correct choice reflects the higher proportion of gold, consistently labeled as 18 carats in the jewelry industry.