pearl gray vs pearl grey

pearl gray and pearl grey both are adjectives.

Word	Noun	Adjective	Verb	Adverb
pearl gray	No	Yes	No	No
pearl grey	No	Yes	No	No

As adjectives, pearl gray and pearl grey are synonyms defined as:

pearl gray (adjective)	pearl grey (adjective)
of a grey with a pearly tinge	of a grey with a pearly tinge