Blue Moon is the name given to the second full moon occurring within a single calendar month, a rare event that inspired the familiar expression "once in a blue moon." Some linguists also suggest that the name may be linked to the Old English term belewe moon, or "betrayer moon," as this extra full moon was once thought to disrupt traditional seasonal calendars. 

"Blue Moon": A deep blue-grey, reminiscent of the quiet night sky. Calm, thoughtful, and quietly mysterious, it carries the character of moments that are rare, memorable, and worth waiting for.