Opal is the birthstone for October. Although there are many varieties of opal the most common used in birthstone jewelry is white opal.
Color - white opal - play-of-color against a white bodycolor. The play of color usually consists of any combination of red, orange, blue, green, and yellow.
Opal
Pink Tourmaline
Pink Tourmaline is the alternate birthstone for October.
Color - pink to red range; may be brownish, orangy or purplish.