Synonyms for blue moon

Think the moon is a blue moon, a single elephantine sapphire.

The blue moon was setting, and soon, they knew, it would be day.

Tis a sweater, and sure theres a blue moon on the front, in the bargain.

“She does get a brilliant idea once in a blue moon,” laughed Peggy.

A stranger in these forgotten villages is as rare as a blue moon.

"I don't see you once in a blue moon any more, Benedict," he had said.

I wonder if its blue diamonds, blue moon, or blue feelings, spoke Bob.

The next instant he was free and dashing toward the front of the Blue Moon.

Once in a blue moon, you get an octopus, but for the most part, you get skeletons.

"But the earthquakes do come, once in a blue moon," he said, still smiling at her.