From a poem- author unknown-believed to be first published by Tiffany's circa 1870:
October's child is born for woe, And life's vicissitudes must know, But lay an opal on her breast, And hope will lull those woes to rest.
Onyx
Onyx is believed to bestow power upon the wearer. It rallies power and makes the mind lucid.
It is believed to alleviate sadness and depression.
Opal
Opal is a mystical stone that engenders and amplifies the second sight (sixth sense). It sets one free of shyness and insecurity
and opens up the ability to be happy and spontaneous.
Opal is used to help treat blood disorders such as diabetes, relieves fever, and PMS.