This one is gold found it awhile back when I first found it I thought it was junk and tossed it in my bag because the black enamel I thought was tarnish. No idea what kind of gold as it isn't marked I'm guessing in the range of 10-14k. I know it's from a sorority from the university of washington but no idea how old. The house that used to stand in the field was there since the early 1900s I don't know when it was gone just know when it used to be there by old pictures I was able to find. Also the field has been worked a long time so anyone could of dropped it but most likely from the house as it was in the area the house stood.