mark something with a white stone

mark (something) with a white stone

obsolete To consider or indicate that something is very favorable, fortunate, or pleasurable. Usually used in passive constructions. Those are days that shall forever be marked with a white stone in my mind.
See also: mark, stone, white

mark something with a white stone

regard something as especially fortunate or happy.
In ancient times a white stone was traditionally used as a memorial of a happy event.
See also: mark, something, stone, white