It's not a "good luck charm"...but, it's more than a mere ID tag, as well.
Let God arise, and let His enemies be scattered; and let those who hate Him flee from His face. As smoke vanishes, let them vanish; and as wax melts from the presence of fire, so let the demons perish from the presence of those who love God and who sign themselves with the Sign of the Cross and say with gladness: Hail, most precious and life-giving Cross of the Lord, for Thou drivest away the demons by the power of our Lord Jesus Christ Who was crucified on thee, went down to hell and trampled on the power of the devil, and gave us thee, His honorable Cross, for driving away all enemies. O most precious and life-giving Cross of the Lord, help me with our holy Lady, the Virgin Theotokos, and with all the Saints throughout the ages. Amen.
I don't wear my baptismal cross for fear of losing it. I actually am saving it for my burial.
The gold one I wear everyday someone can take and use upon my death. I want to be buried with the cross that was given me when I entered in to the Church.