For your consideration is this very retro necklace by Trifari. I believe it is circa 1960s. It has a nice large gold tone modernistic pendant. The green and yellow marble section have tested and are guaranteed bakelite. It carries a double chain to be worn as shown in the last picture.The mark is Trifari followed by the copyright symbol as shown.
The pendant is big and measures and 1/4 inches by 1 and 3/4 inches. The shortest chain measures 18 and 3/4 inches and the longer chain measures 30 inches.
The piece is in excellent condition and fully functional. The yellow dotting in the pendant is within the bakelite and part of the making.