Handcrafted, notice how the fin actually has a small pin going through to hold the stone and is peened on the reverse side. Very nice! The stone is a light green with darker bands of green. The stamp on the reverse side is difficult to make out because it has been double stamped or superimposed over the first stamping. I can make out Mexico stamped twice and Silver and perhaps 925 but not much else. Measures 1-3/4" x 2". Lovely patina and in the best condition!