During 1930-1935 period, Bogart had hard times. He shuttled back and forth between Hollywood and the New York stage, suffering long periods without work. His parents were living separately and Belmont died in 1934 in debt, which Bogart eventually paid off. (Bogart inherited his father’s gold ring which he always wore, even in his films. At his father’s deathbed, Bogart finally told Belmont how much he loved him.)
I inherited a ring from my father that is the reverse of this one: red stone in the center, small diamonds on either side.
You can see this ring clearly at Bogart's entrance signing "OK. Rick." on a voucher. He picks up the cigarette, then we see his face, and there's the ring.