WORTH ITS WEIGHT IN GOLD

Meaning: if something is worth its weight in gold, it’s very meaningful, useful or/and valuable.

For example:

When Alter is a citizen – his speeches are worth their weight in gold, so you should do your best to listen them carefully.
Each English Mafia Club member is worth their weight in gold in terms of personalities and their psychological education.

You can practice this idiom soon at one of the English Mafia Club’s upcoming meetings: https://englishmafiaclub.com/events/upcoming-events