Ruby Roman is a variety of table grape grown and marketed entirely in Ishikawa Prefecture, Japan.

[2] In July 2016, a single bunch of Ruby Roman grapes, containing 26 grapes at a weight of about 700 grams, sold for 1.1 million yen (around $8400) in the year's first auction at a wholesale market in Kanazawa.

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.