hi i have a diamond ring that im not sure of if the diamonds are real or not...its been in my family for about 15 years that i know of ,but on the inside it has a 925 mark which clearly says that is made of silver but the other mark on the inside is a C^A symbol its clearly a letter c with what looks like a arrow pointing up followed by a letter a anyone know what this symbol means?? im trying to get pics posted soon. thanks in advance for any feedback.