Herbert Douglas, 19, of Washington, pleaded guilty yesterday in D.C. Superior Court to seven counts stemming from the robbery of a downtown jewelry store last year in which he and two police officers were shot.

Douglas had been scheduled to go on trial today with Jerome Fields, 19, also of the District. Both men are charged with six counts of assault in connection with the robbery Nov. 17, 1981 of the Wedding Ring store, 1909 I St. NW.

Appearing before Judge Peter H. Wolf yesterday, Douglas pleaded guilty to four assault charges, each of which can draw a sentence of life, as well as three lesser counts.

Prosecutors had offered to reduce charges against Douglas in exchange for his testimony against Fields, but Douglas declined. He is being held without bond and no date for sentencing was set. Trial for Fields was continued to Feb. 18.

Douglas was wounded during an exchange of gunfire with five officers outside the store. They had responded to a phone call from the store's owner, who became concerned about the appearances and attitudes of two customers.

Douglas was shot in the abdomen, groin and hand. Police Officer James T. Bovino, 33, was wounded in the abdomen and Officer Andrew Merenko, 34, suffered a minor head wound. Both Bovino and Merenko have since returned to duty.