Pope Pius XII Vatican Medal Pendant, Italy

From an estate sale, this is a 1950 Vatican medal that can be worn as a pendant. Pius XII served from 1939 to 1958. I believe this may be sterling silver; it is not attracted to a magnet. I have not cleaned or polished this. Please see ruler for size. The weight is approx. 6 grams. The text on this reads as follows. PIVS XII PONT MAX AN IV8 MCML, DOMVS DEI ET PORTE COELI, Made in Italy.