How is the ruby described in chapter 18 or more specifically around 185 page

The Maharajah offered the Ruby to Lockhart in return for protecting him. When the rebels murdered him, Marchbanks begged Lockhart to give him the Ruby. Lockhart exchanged it for Marchbanks' baby girl, Sally. Lockhart did not want the child growing up with a drug-addict for a father. Marchbanks took the Ruby and Lockhart took Sally. As she grew up, Lockhart let her believe that he was her father, and made up a story about a fake mother.

Sally tells Mrs. Holland that the Ruby has only brought misfortune, and she throws it into the river. Mrs. Holland dives in after it and is drowned. However, just as Sally thinks it is all over, a man draws up in a cab and tells her to get in. He tells her that he is Hendrik Van Eeden, also known as Ah Ling.