GEMINI - Witty Unpredictable And Chatty AF. A perfect card for sending a birthday wish to the Gemini people in your life. Gemini celebrates birthdays May 22nd - June 21st. • Measures 4 x 5.5 inches • Printed on acid and lignin free white card stock (A2) folded • Brown Kraft envelope • Blank inside ready for you to write a personal message.