Ruby Roman grapes are the most expensive table grapes in the world. They are only cultivated in Japan and are sold at high-end fruit markets and auctions.

Why are Ruby Roman grapes so expensive?

There are three main factors that contribute to their high price: the unique color, taste, and size. These qualities were developed and cultivated by a group of farmers in Ishikawa Prefecture, Japan.

Ruby Roman grapes are known for their ping-pong ball size and heightened sweetness. They also are believed to bring prestige and luck. They are so rare that the Ishikawa administration has put strict rules on the sale of them.

Premium grapes can sell for up to $11,000 at auction, according to Business Insider. Only one or two bunches a year qualify for this price point.

The grapes need to meet a set of perfection standards to qualify for Premium, including weighing at least 30 grams per grape and having more than 700 grams in a single bundle. The amount of light a bunch gets and the temperature are also crucial for quality.

These rules are extremely stringent, and a bunch has to be evaluated by a team of experts to make sure it meets these requirements. It's important for them to keep a consistent level of quality throughout the year so that each crop can have a good chance of achieving this level of success.

These strict guidelines are why Ruby Roman grapes are so expensive. These grapes are so highly valued that their prices can sometimes be as high as $100 a bunch at specialty produce markets or on websites that sell specialty fruits.