She said Richard and John had made their relationship official 10 years ago.
Pipe had initially read the ring's internal inscription as "A&J 21/06/2008". But after hearing from the owner she realised that what she had thought was an "A" was actually an "R".
She had posted a "found" notice and picture of the on Facebook which was shared about 2000 times.
Pipe said the couple contacted her via Facebook last night and told her they had been gutted by the loss of the ring.
She hopes it can be slipped back onto John's finger soon.
"We haven't met them yet but we hope to, hopefully next week or later on in the month when they are over at Waiheke Island."