touchstone suggests a simple test of the authenticity or value of something intangible.

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Parasmani (lit. 'Touchstone'), a 1963 Indian film.

TOUCHSTONE definition: 1. an established standard or principle by which something is judged: 2. an established standard…. Learn more.

touchstone (of/for something) something that provides a standard against which other things are compared and/or judged. Grammar was regarded as the touchstone of all language performance. He …

TOUCHSTONE definition: a test or criterion for the qualities of a thing. See examples of touchstone used in a sentence.

If you use one thing as a touchstone of another, you use it as a test or standard by which you judge the second thing. Job security has become the touchstone of a good job for many employees.

touchstone, n. & adj. meanings, etymology, pronunciation and more in the Oxford English Dictionary

Use the noun touchstone to describe a basis for comparison. For example, a filmmaker's touchstone might be her all-time favorite movie; she wants her movie to be that good or similar to it in some way.