Merchant and jeweler. At the age of eleven, David began serving his apprenticeship to the watchmaker's trade. After his graduation he taught school for a year and then came to the United States to join his relatives Louis and Eugene Jaccard, who were already in business in St. Louis. Louis founded the house under the name of Jaccard & Recordon. Six years later Eugene Jaccard became a partner in the firm, the name of which was changed to Jaccard & Co. In 1844 they sold their establishment, but regained possession of it a year later. Eugene became the sole owner in 1849. In 1853 he admitted to partnership with him A. S. Mermod, and in 1855 D. C. Jaccard, under the firm name of E. Jaccard & Co. The business was continued under this name until 1862. D. C. Jaccard and A. S. Mermod then joined forces and purchased a jewelry establishment under Odd Fellow's Hall in St. Louis, founding what became one of the most famous jewelry houses in the United States. In 1873 the firm name was changed to Mermod, Jaccard & Co., followed by the name of Mermod & Jaccard Jewelry Company in 1883. The house had its own watch manufactory in Switzerland as well as in Paris and various other cities in Europe.
In 1868 Mr. Jaccard was appointed vice-consul for Switzerland in St. Louis and later acted as consul for that country for two years. During the Civil War, as treasurer of the "Societe du Sou par Semaine," he distributed over twenty thousand dollars to relieve the wants of those who suffered from the effects of the great struggle then going on, without regard to their sympathies either with the North or the South.