Police seeking to return a valuable diamond bracelet to its rightful owner have been bombarded with hundreds of comments from people claiming the valuable item belongs to them.

Officers from the Hawkesbury Police Area Command posted a lost and found notice on their Facebook wall, saying they were looking for help to locate the owner of the diamond "tennis bracelet".

The 20cm bracelet is adorned with about 40 2mm diamonds set in white gold. While the value is not known, pictures show the bracelet is quite stunning and sparkly. Police said the tennis bracelet was found in December last year, and since that time, nobody has made a report about it being missing.

"Police are making this social media appeal in an attempt to return the item to the owner, upon satisfactory proof of ownership," Hawkesbury Police said on Facebook.

Then came hundreds and hundreds of comments from people, sarcastically claiming to be the owner of the highly valuable bracelet.

"Thank god you guys found it I've been looking for it everywhere it was my favourite one," one woman said, followed by prayer hand emojis.

"Oh my goodness Jessica," a man commented. "They have finally found your beloved tennis bracelet! I can't wait to have it back in our possession."

"I think it’s mine. I have to be more careful with my belongings," another woman commented.

"This is mine. Thank you Hawkesbury police for locating," another man said.

"If it's real I'm pretty sure it's mine," another said.

Many others offered to give the lost bracelet a new home.

"I'll be happy to own it and promise not to lose it again," one woman said.

"I don’t play tennis but I’m happy to sport it around anyways," another person said.

"I can fly to syd to get it," another commented. It's unclear whether they were the owner or not.

"If nobody claims it, I will kindly accept it as a gift from NSW Police," one woman kindly offered.