The antonyms for "more twentyfourcarat" could be words that connote a lack of quality or value. These antonyms could include: cheap, fake, diluted, impure, tainted, second-rate, or substandard. Alternatively, antonyms could also focus on the quantity or amount of something, such as: less, few, little, or minimal. These terms suggest a smaller or lesser quality or amount of something, which contrasts with the concept of being "more twentyfourcarat." Overall, antonyms for "more twentyfourcarat" can connote a lack of value, quality, or quantity, which oppose the positive attributes associated with the term.