Samuel T. Schwartz, 84, chairman of the board and son of the founder of Charles Schwartz and Son Jewelers, died Sunday at his home in Washington after a long illness.

Mr. Schwartz was born in Philadelphia. He came to Washington in about 1906 with his parents when the business that his father founded in 1888 moved here from that city.

After serving in the Navy as an officer during World War I, Mr. Schwartz returned to the family business and assumed control when his father died in 1937, continuing the firm's noted personalized service.

The jewelry store, which occupied several downtown locations before moving to its present site at 1313 F St. NW. is scheduled to move to the Mazza Gallery in Friendship Heights this year. A small branch is also maintained at the Mayflower Hotel.

Mr. Schwartz was succeeded as president of the firm in 1955 by his son, Charles Schwartz II, and remained active as chairman of the board until his illness last year.

He was a member of the Washington Hebrew Congregation and had belonged to the Kiwanis Club of Washington since 1920. He was one of the charter members of the old Merchants and Manufacturers Association which later merged with the Washington Board of Trade.

In addition to his son, of Washington, Mr. Schwartz is survived by his wife of 58 years, the former Eugenia Lansburgh, of the home, and two daughters, Molly Brylawski and Eugenia Siegler, 10 grandchildren and three great-grandchildren, all of Washington.