hi, i have just received a gold ring, that might be from the early 1920's, it is amythest the stone sits in a crown like setting with a rope surronding the crown with a leaf like piece attached to the rope at four quarters, it is stamped on the outside on either side of the crown 14k with a stamp of a "B" or an "S" as well. I'm not sure. This is the first time i've tried to identify it. any help? The stone is about is about an inch in size and 3/4 wide, it is a rather large substantial ring