Ruby Roman grapes are renowned as the world's most expensive grapes.
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They were developed by Japanese grape farmers in Ishikawa Prefecture, starting in 1995.
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Through selective breeding, these grapes were improved for size, taste, colour, and growth characteristics.
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They made their debut in 2008, gaining attention when a bunch sold for $910.
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Ruby Roman grapes are categorized into three classes: basic, Special Superior, and premium, each with specific criteria.
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Basic Ruby Roman grapes must weigh over 20 grams and have 18% sugar content
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Special Superior grapes exceed these standards in colour, size, and sugar content
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Premium Ruby Romans must weigh at least 30 grams, with the bunch totalling over 700 grams.
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These grapes have distinctive characteristics, including a thin skin, meaty flesh, low acidity, high sugar content, and a delightful fragrance.
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Ruby Roman grapes are primarily intended for direct consumption and offer health benefits due to their antioxidant content, supporting the immune system.