Wiktionary
a. (context idiomatic English) Very valuable.
Usage examples of "worth its weight in gold".
On the one hand, seeing Baxter get his comeuppance was worth its weight in gold.
These days, a bag of chocolate chips was worth its weight in gold.
He was obviously in love with her, but as far as I know, he never went any further than to clutch my mother's hand, ardently described as worth its weight in gold, and to impress a silent kiss upon it -- except for the time I shall speak of in a moment, when he fell on his knees.
The body that was worth its weight in gold pranced and scrunched on the hard apron, wheeling round impatiently and tossing its uncomprehending head.
A ponderous water-wheel, moving a linkage of iron levers, raised and lowered a straight-bladed saw of forged steel nine feet long and worth its weight in gold.