The woman was at home in Larkhall Lane, Harpole, at about 3.45pm on Friday, November 6, when the man broke in through the back door.
A police spokesman said he was armed with an unspecified weapon and shouted “Give me your gold or I’ll set this off on you”.
The woman responded by hitting him in the chest with a vase and telling him to ‘get out’.
The man then ushered the woman into her bedroom, shut the door and searched the room, stealing a purse with some cash in it.
Remembering the drought of 1976 across Northamptonshire in pictures from the archive
Eight pumps tackling large fire at Corby recycling centre
Muslim woman left in tears after Kettering McDonald's wrongly puts bacon in burger
Kettering town centre restaurant ready to reopen with new menu and 'surprises'
Free festival for all taking place in Corby tomorrow
He then left the property with a woman who it is believed had been keeping watch outside
He was white, aged 24 to 25, between 5ft 6in and 5ft 7in and slim with a pale, long face. He had a local accent and was wearing a grey woolly hat and a waterproof jacket.
His accomplice was white with shoulder-length scraggly ginger hair. She was about 5ft 6in and of medium build. She was also wearing a waterproof jacket.
Both offenders rode away from the scene on bicycles towards Sandy Lane.
Witnesses, or anyone who knows anything about this incident can call Northamptonshire Police on 101.
Alternatively, they can call the independent charity Crimestoppers anonymously on 0800 555 111 or use the anonymous online form at www.crimestoppers-uk.org.