J. Crew necklace

Adjustable length J. Crew statement necklace. Turquoise-y light blue oval shaped stones and clear gemstones on silver toned metal. Metal shows some discoloration/ coppery spots shown in pictures. I don’t know what kind of metal it is and haven’t tried to clean it, but it isn’t noticeable when worn. Brass tones clasp can be hooked to different rings to adjust length- works with a variety of necklines. Feels substantial/weighty for costume jewelry!