The grapes are grown in Ishikawa prefecture and to qualify for the Ruby Roman designation, each grape must weigh at least 20g and have a sugar content of at least 18 percent, the Guardian reported.
The buyer of Thursday's bunch promised to dole out samples to a few fortunate patrons.
"These are truly Ruby Roman gems," bidder Takamaru Konishi from western Japan told the press, adding "We will display them at our store before giving our customers a sample taste."
The sale kicks off the auction season for Ruby Romans in Japan. Other fruits, from apples to watermelons, can also fetch huge sums under the hammer.