Jacob Mehrlust (1877 – 1960) was a prominent manufacturer of fine jewelry, active in the namesake firm from 1900 until his death in 1960. Almost forgotten today, he was a trendsetter in jewelry design of the first half of the 20th century.

The Main Office and Factory of J Mehrlust firm was on 6 West 48th Street, and Downtown Office – 15 Maiden Lane, New York City. Notably, Jacob Mehrlust designed much of the beautiful diamond jewelry presented to Miss Alice Roosevelt, daughter of president Roosevelt, as wedding gifts. He also designed several pieces presented to Mrs. Woodrow Wilson.
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The founder of the Delmas jewelry brand was renowned jeweler and watchmaker Peter Delmas (1903–1991). The first mention of the Delmas jewelry firm dates back to August 1949. In particular, the JCK note mentioned their new office located in the Phelan Building at 700 Market Street in San Francisco, California.

According to National Jeweler magazine (1957), Leonard Delmas (1929–2015), the founder’s son was his partner. He actively helped expand the family business by undertaking large-scale projects at Delmas & Delmas. In November 1960, Delmas & Delmas, designers and merchants of fine jewelry, opened the new store at 182 Geary Street in San Francisco.
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