Month Gem Guardian Angel
January Onyx Gabriel
February Jasper Barchiel
March Ruby Malchediel
April Topaz Asmodel
May Carbuncle Ambriel
June Emerald Muriel
July Sapphire Herchel
August Diamond Humatiel
September Jacinth Zuriel
October Agate Barbiel
November Amethyst Adnachiel
December Beryl Humiel

The ancient term carbuncle refers to any red gem. Historically, stones referred to as carbuncles were likely red garnets. Jacinth was likely either a transparent, reddish brown zircon or hessonite garnet, although the term sometimes referred to blue stones, too.