IPA: /ˈbɜrθˌstoʊn/
KK: /ˈbɜrθˌstoʊn/
A type of gemstone that is linked to a specific month and is traditionally worn by people born in that month.
My birthstone is emerald because I was born in May.
Birthstone → The word is formed from "birth" (from Old English "berthan", meaning to be born) and "stone" (from Old English "stan", meaning a solid mineral matter). A birthstone is a stone associated with the month of one's birth, symbolizing the time of birth.
Think of the time you were 'born' ('birth') and the 'stone' that represents that month — that's why a birthstone is a stone linked to your birth month.