Gold dolphin Earrings

I have had these earrings for a very long time and can not find any information as to what they are made of excatly or what the value might be should I want to sell them. If anyone could please ID them/set value?

they appear to be gold or gold plated? The loop itself is fairly thick and it is flat on the back and has etching on the other side on the "waves" and the dolphin. Really cool looking but I don't wear jewerly! Thanks for your time and efforts!

Fair