Vintage 10K white gold plated single rhinestone turtle pin/brooch. I searched the internet for another pin like this one and found nothing. I believe it to be 10K gold plate. There is no stamp that I could find anywhere on it. It is a very soft metal consistent with silver and gold, and also is thin like a solid gold/silver piece would be. With 10K gold acid test, the gold stays a while before almost disappearing so I believe it to be gold plated. However, since I am not a jeweler, and don't know for sure. I am selling it for a really good price if it is gold. My ignorance is your gain!