worth one's weight in gold

worth one's weight in gold idiom
Also, worth its weight in gold. Very valuable, as in John's been extremely helpful; he's worth his weight in gold, or That tractor's been worth its weight in gold. This metaphoric term dates from Roman times and appeared in English by the early 1300s.

The American Heritage® Dictionary of Idioms by Christine Ammer. Copyright © 2003, 1997 by The Christine Ammer 1992 Trust. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

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