Gardai were today hunting for the two men who struck at Greene's on Aungier Street just after 5pm yesterday.
Armed raiders stormed a Dublin jewellery store yesterday.
One masked man shouted "I'll blow your f***ing head off" as he pointed the handgun at staff.
The two men escaped with three trays of gold rings worth more than €20,000 after the terrifying hold-up.
Shopkeeper Karl Ryan was "looking down the barrel of the gun" as the men smashed through glass cabinets with a hammer (inset left).
"He was shouting for me to keep back, saying he would 'blow my f***ing head off' as his mate smashed his way into the front window and loaded the trays into a bag," Mr Ryan told the Herald.
Mr Ryan said that the incident lasted just 30 seconds but "it felt like hours".
"I just heard the bang and came running out from the back room to see the gunman running towards me. I picked up a chair and threw it at him," he explained.
"At that point I was just looking down the barrel of the gun. I just sort of left well enough alone and left them to it."
"They seemed to know what they were after, and it wasn't the most valuable stuff in the shop, but it would be easy to dispose of because it was mainly gold wedding bands.
"They were in and out, smash and grab," he added.
Today the damage to the shop is plainly visible. The glass in the front door is broken under the stress of being shouldered by the raiders, and a glass panel inside the door to prevent people walking to the window area was also broken. The cash register was in plain view of the gunman but he never demanded cash at any stage.
"They knew exactly what they wanted," said Mr Ryan, who is the third generation of his family to be a jeweller. This shop is here since the 1940s, and it's been a long time since we were robbed before.
"It's always a shock when it happens.
"Anything to do with gold at the moment, it's commanding a high price and it's easy to get rid of," he said.
Both raiders were wearing high-visibility yellow jackets and jeans, and looked like construction workers.
One had a blue hard hat on, and the other was wearing a blue balaclava and blue hoodie.
Mr Ryan described them as both being in their in their late 20s or early 30s having Dublin accents. The man armed with a gun was around 6ft 3ins tall. The second raider is around 5'10- 6ft.
The car the raiders escaped in, a grey Opel Astra with an 07 reg, was abandoned in Aungier Lane near the Cuffe Streeet flats. It was reported stolen from Harold's Cross on November 9.
Anyone with information is asked to contact Pearse St. Garda Station 01 6669000 or the Garda Confidential 1800 666 111.