IPS PEARL NECKLACE WITH CAMEO: 4-Strand pearl necklace with sterling mounted carved cameo pendant measuring approx. 1.5'' x 1''. The button pearls well matched with good luster. Marked 925 and IPS at the clasp. IPS stands for Imperial Pearl Syndicate founded by Joseph Gladstone in 1917. Measuring 16.75'' in length with a 2.5'' extender chain. Weighing a total of 88g.