bass Bill Plummer
clavinet Paul Beaver
composed by Emil Richards
drums Joe Porcaro
engineer Dave Weichman
percussion Mike Craden
percussion [all mallet instruments] Emil Richards
photography by Bernard Yeszin
piano Dave Mackay
producer Marshall Leib
synthesizer Emil Richards
synthesizer [moog synthesizer] Paul Beaver
Liner notes indicate that the instruments used were Dr. Irv Wilson's 22-tone-to-the-octave instruments...

Emil Richards has written twelve original compositions describing the twelve birthstones.