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