"She was devastated. It really put a dampener on the evening," Mrs de Pont said.
The signet ring had sentimental value to Jackie who got the ring as a Christmas present.
Mrs de Pont received a signet ring for her own 15th birthday, so wanted to do something special for her daughter and niece. She had old gold jewellery melted down into the same style as hers, and got their initials engraved onto it.
The balloon started its journey from halfway up John Davis Rd, Mt Roskill, so Mrs de Pont is asking people in the area to keep a lookout in trees, backyards or surrounding parks for a presumably deflated balloon.
Anyone who spots the runaway balloon and ring can contact Mrs de Pont on (027) 343 7520.
Mrs de Pont said she is also willing to pay a reward to the person who finds the ring.