Pink Tourmaline engagement rings? Absolutely! Diamonds may be a girl's best friend, but Pink Tourmaline engagement rings are a unique, original, and a far more affordable choice. Pink tourmaline is a birthstone of October, along with opal, and is a truly special gem. The deep rosy color of a pink tourmaline ring will be sure to attract attention. November's birthstone, citrine sparkles like honey. Carry the warmth and glow of a golden sunset with you by wearing a beautiful citrine ring.