Bidders in the room battled for the ring, which boasts a six-carat centre stone and 8.22 total carat weight within 2.22 carats of surrounding stones and a $5,000 mounting.
One determined participant finally claimed his prize, making the ring the top achiever of the 285 lots sold.
The frenzied bidding could have been partly down to the fact that there were no phone or internet bidding components.
The ring was one of more than 30 pieces of estate jewelry that changed hands.
Others sales included a 2.83-carat emerald ring with 1.80 carats of surrounding diamonds for $6,600; a 2.29-carat total weight, three-diamond past-present-future ring for $3,575; and an antique platinum 1.29-carat emerald and diamond pendant on pearl necklace for $2,310.
"We sold entirely to the room, around 150 people," Hal Hunt of Hal Hunt Auctions remarked in a statement. "For a little summer estate sale, I'd say we had a pretty good day."
All prices included a 10% buyer's premium.