The Ruby Roman is a variety of table grape grown and marketed entirely in Ishikawa Prefecture, Japan. It is red in color and about the size of a ping-pong ball. The first Ruby Roman grapes went on sale in August 2008 for 100,000 Japanese yen (US$910) per 700-gram bunch, or $26 per grape. They are said to be the most expensive variety of grapes.  In July 2015, a single bunch of Ruby Roman grapes, containing 26 grapes at a weight of about 700 grams, sold for 1 million yen (around $8400).
In 2008, the Ruby Roman grape debuted as a new variety of premium grapes in Japan. The new grape was named Ruby Roman via public referendum. Every grape is checked strictly to guarantee its quality, with certification seals placed on those thus selected. The Ruby Roman has strict rules for selling; each grape must be over 20g and over 18% sugar. In addition, a special "premium class" exists which requires the grape to be over 30g and where the entire fruit bunch must weigh at least 700g. In 2010, only six grapes qualified for premium status while in 2011, no grapes made the cut. 
- "Bunch of grapes auctioned for $910 in Japan - Business - US business - Food Inc. - msnbc.com". MSNBC. 2008-11-08. Retrieved 2012-06-08.
- Du, Lisa (2015-07-09). "Bunch of Grapes Sells for Record $8,200". Wall Street Journal. Retrieved 2015-07-09.
- Food of Ishikawa
- Ruby Roman Club
- National Federation of Agricultural Cooperative Associations Ishikawa Prefecture headquarters
- Ishikawa Prefecture Government
- See YouTube for a consensus review and discussion on The Mijonju Show ('The Mijonju Show - The most expensive grape in the world Ruby Roman.')
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