Adjective
(of an asset, especially New Zealand) Of high and enduring value.
Synonym: goldlike
(especially UK, of a person, simile) Very well-behaved (especially of a child); very good-hearted (especially of an adult).
Source: en.wiktionary.orgI think the word of the United States has been as good as gold in its international dealings and its agreements. Condoleezza Rice
The finest compliment you can pay a man is that his word was as good as gold. Evel Knievel