Two males entered a jewellery shop in the city centre carrying a firearm at approximately 5pm.
They pair threatened staff in the shop before leaving with a quantity of jewellery, including three display trays of gold rings.
The raiders escaped in a grey Opel Astra and abandoned the vehicle on Aungier Lane a short distance away.
One of the males has been described as tall (well over six foot) and was wearing a blue balaclava, a sleeveless yellow high-visibility jacket and a blue hard hat.
The second had been described as shorter in height (about five foot ten) and was wearing jeans, a blue top, a sleeveless yellow high-visibility jacket and a blue hard hat.
Gardai are also seeking information on the car used in the armed robbery. The grey Opel Astra has a partial registration of ’07-C’.
The vehicle was taken during a burglary on the night of November 9 in the Harold’s Cross area.
Anyone with information is asked to contact Pearse St Garda Station on 01-6669000 or the Garda Confidential line on 1800-666-111.