Ruby Roman
ルビーロマン
Ruby Roman is a large-berry red grape developed by the Ishikawa Prefecture Agricultural Research Center. Every certified berry must weigh 20 g or more, reach Brix 18+, and hit color level 3–4 on the proprietary Ruby Roman color chart. Its annual opening auction at Kanazawa Central Wholesale Market regularly generates global news headlines — in 2023 a single bunch sold for ¥1,600,000 (roughly $11,000 USD), securing its reputation as one of the world's most expensive fruits.
About Ruby Roman
Ruby Roman is a premium large-berry red grape developed by the Ishikawa Prefecture Agricultural Research Center (formerly the Sand Dune Agricultural Experiment Station). The breeding program began in 1995 when approximately 400 naturally crossed (chance) seedlings from a Fujiminori grape field were sown and evaluated. Plant Variety Protection registration (No. 15020) was granted on March 15, 2007, and the first commercial shipment reached market in 2008. Ishikawa Prefecture holds the breeder's rights. The Ruby Roman Promotion Council (ルビーロマン推進協議会) enforces berry-by-berry inspection before any bunch earns the Ruby Roman label. Three conditions must all be met: (1) each berry weighs 20 g or more, (2) Brix sugar content is 18° or above, (3) colour matches level 3–4 on the proprietary Ruby Roman colour chart. The top-tier 'Premium' grade requires both 30 g+ per berry and 700 g+ per bunch. The annual opening auction (初競り) at Kanazawa Central Wholesale Market in mid-July has become a recurring global media event. The record price reached ¥1,600,000 for a single bunch in 2023 (approximately US$11,000). Total annual certified shipments are around 25,000–30,000 bunches — an extremely small volume that underpins the auction-price phenomenon. The season runs July through September; outside Japan, Ruby Roman is effectively unavailable at retail.
Taste & Texture
Ruby Roman combines three traits in one variety — very large berries, high Brix, and a vivid ruby-red colour — that rarely appear together in commercial table grapes. Standard certified berries weigh 20–30 g; Premium-grade berries exceed 30 g, reaching the size of a ping-pong ball. Colour is a distinctive ruby red classified at level 3–4 on the proprietary Ruby Roman colour chart, clearly distinguishing it from the purple-black tones of Kyoho or Pione.
Sensory profile
- Size: 20 g+ per berry (standard); 30 g+ (Premium); diameter typically 3–4 cm (1.2–1.6 in)
- Brix (sugar): 18°Bx minimum by brand standard; actual retail fruit often reads 20–24°Bx
- Acidity: mild; the sugar is rich but the finish is clean — described as a transparent sweetness rather than cloying
- Skin: moderately thick; can be eaten skin-on but peeling delivers a more refined eating texture
- Flesh: firm and juicy; the aroma is gentle and refined without the heavy Muscat assertiveness of some European varieties
- Seeds: seeded (no seedless treatment is applied)
Grade tiers
- Standard Ruby Roman: 20 g+ per berry, Brix 18+, colour level 3–4
- Premium: 30 g+ per berry AND 700 g+ per bunch, Brix 18+ — the top designation (extremely limited annual volume)
Opening-auction record prices at Kanazawa Central Wholesale Market (July each year)
- 2020: ¥1,300,000 per bunch (≈ US$9,000)
- 2021: ¥1,400,000 per bunch (≈ US$9,600)
- 2022: ¥1,500,000 per bunch (≈ US$10,300)
- 2023: ¥1,600,000 per bunch (≈ US$11,000) — record high
- 2024: ¥1,000,000 per bunch (≈ US$6,900)
Season
PEAK
Aug
Top Production Areas
* Major producing areas reflect general shipment trends; rankings shift with year and statistical scope.
Variety Comparison
vs. Shine Muscat
Both are Japan's most celebrated premium grape varieties, but they differ in almost every attribute. Shine Muscat is a yellow-green, seedless cultivar bred by NARO with an edible skin and a bright Muscat aroma; it is grown across multiple prefectures (Yamanashi, Nagano, Okayama and others), ships in volume, and is the more attainable of the two — stocked at premium Asian grocery chains across East and Southeast Asia. Ruby Roman is exclusive to Ishikawa, seeded, large, and ruby-red, with a certified annual shipment of roughly 25,000–30,000 bunches that essentially never leaves Japan. Price tiers are worlds apart: a standard Shine Muscat gift box tops out at a few thousand yen, while even a bottom-tier Ruby Roman bunch is several thousand yen, and opening-auction lots reach millions. For readers outside Japan seeking a premium Japanese grape, Shine Muscat is the realistic path; Ruby Roman is effectively inaccessible.
vs. Pione
Pione is one of the ancestry pathways of Ruby Roman's parent variety, Fujiminori. It is a large purple-black grape crossed from Kyoho and Cannon Hall Muscat, with Brix around 16–18° and a well-regarded sweet-tart balance — a high-quality everyday-premium variety available nationwide at prices well within the range of standard luxury fruit. Ruby Roman sits in a completely different tier from Pione in terms of colour (ruby red vs. purple-black), scarcity, and price point. The shared lineage does produce some flavour kinship — both have a rich, juicy sweetness — but Ruby Roman is considerably larger, typically higher in Brix, and visually unmistakable.
vs. Cotton Candy Grape (US)
Included here as a reference point for readers outside Japan seeking a substitute. Cotton Candy Grape is a proprietary commercial cultivar from US breeder Grapery (IFG), named for its distinctively sweet cotton-candy-like aroma and high Brix in a green-skinned package. Its novelty factor and price premium relative to commodity grapes share some conceptual ground with Ruby Roman as a 'conversation-piece' fruit. However, the two differ on every substantive dimension: Cotton Candy is green rather than red, far smaller per berry, widely available in North American summer supermarkets, and priced as an accessible premium rather than an unobtainable auction lot. For a red large-berry table grape closer to Ruby Roman's visual profile, commercial varieties such as Scarlet Royal (grown in Italy/Spain) or Autumn Royal (grown in Chile/California) are structurally more similar — though none approaches Ruby Roman's size or Brix.
Breeding History
Ruby Roman's story begins with a prefectural breeding project at what was then the Ishikawa Prefecture Sand Dune Agricultural Experiment Station (now part of the Ishikawa Agricultural Research Center). In 1995, researchers collected approximately 400 naturally crossed seeds from a Fujiminori grapevine planting and began sowing and selection. Fujiminori is a large dark-red grape known for its size; what the breeders targeted was a combination not yet established in the Japanese market — very large berries, high Brix, and a vivid ruby red rather than purple-black. After nearly ten years of selection and evaluation, one individual plant consistently produced berries exceeding 20 g with Brix reliably above 18°, meeting the research team's target traits. The researchers named the variety 'Ruby Roman' — evoking the lustrous gem red of the fruit and the romantic allure they wanted the product to project. Formal registration under Japan's Plant Variety Protection law was completed on March 15, 2007 (PVP No. 15020), and the first commercial shipment reached Kanazawa market in summer 2008. From the very first shipment, the brand adopted a berry-by-berry inspection protocol — an unusually labour-intensive standard in an industry that typically grades fruit by the box or cluster. This single inspection decision is structurally central to what Ruby Roman is: every berry in every certified bunch has individually passed three tests. The 2008 opening auction already cleared ¥1,000,000 per bunch, triggering domestic and international media coverage that established the 'world's most expensive grape' narrative from the start. The Ruby Roman Promotion Council has consistently prioritised quality maintenance over volume expansion. About 100–200 growers in Ishikawa Prefecture participate; total certified annual shipments are held at roughly 25,000–30,000 bunches. Ishikawa Prefecture retains the breeder's rights and controls seedling distribution to prevent cultivation from moving outside the prefecture, keeping the brand geographically exclusive.
- Breeder
- Ishikawa Prefecture Agricultural Research Center (formerly the Sand Dune Agricultural Experiment Station, Kanazawa)
- Parentage
- Selected from naturally crossed (chance) seedlings of Fujiminori
- Registered
- 2007
- PVP Reg. No.
- No. 15020
Source: MAFF Plant Variety Registration Database / Breeder / brand council publication
How to Choose
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Ruby Roman is distributed exclusively through the Ishikawa JA channel; certified bunches carry a dedicated Ruby Roman Promotion Council label and ship in premium gift boxes.
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Standard-issue supermarkets do not carry it; sales occur at department stores, luxury fruit shops, and direct-purchase routes from Ishikawa. What to look for in Japan: (1) Certification label: confirm the Ruby Roman Promotion Council seal and branded packaging.
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Without this, the grapes are not certified Ruby Roman. (2) Berry size: every berry in a certified bunch is 20 g or heavier — visually they are strikingly large and uniform. (3) Colour: a vivid jewel-like ruby red, matching colour-chart level 3–4.
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No dullness, purpling, or uneven coloration. (4) Bloom: a uniform white waxy coating on the berry surface signals freshness. For gift purchases in Japan, early-to-mid August is the optimal window for peak-season stock.
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The mid-July opening-auction period generates headlines but has very limited volume. For readers outside Japan: Ruby Roman is essentially unavailable internationally.
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Annual certified shipments of approximately 25,000–30,000 bunches are almost entirely absorbed within Ishikawa and Japan's domestic premium market (department stores, luxury hotels, traditional restaurants).
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Occasional lots may appear at high-end Japanese-import specialty retailers in major cities during August, but this is rare and prices reflect the scarcity.
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If your goal is a premium Japanese grape experience outside Japan, Shine Muscat is the more accessible option, available in Asian grocery stores across East and Southeast Asia.
How to Store
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Ruby Roman is at its peak immediately after arrival and should ideally be eaten the same day or the next day.
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As soon as the gift box arrives, remove the berries from the packaging, check for any damaged fruit, and refrigerate in a covered container lined with paper towel — berries should not touch each other.
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Store in the refrigerator crisper at 3–5°C (37–41°F) and consume within 2–3 days. Recommended steps: 1.
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On arrival, open the box and inspect; remove any bruised berries immediately 2.
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Without washing, arrange berries in a single layer in a covered container lined with paper towel 3.
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Refrigerate in the crisper at 3–5°C (37–41°F); consume within 2–3 days 4.
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Remove from refrigerator 30 minutes before eating; rinse lightly just before serving — slight warming helps the aroma open up Ruby Roman is not suited to long-term storage.
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Given the price and the narrow season, prioritise eating it as fresh as possible.
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There is no benefit to waiting, and quality drops faster than with mass-market grape varieties.
Frequently Asked Questions
Why is Ruby Roman so expensive?
Ruby Roman's price reflects four structural factors working together. (1) Tiny volume: annual certified shipments are roughly 25,000–30,000 bunches, measured in individual bunches rather than the tonnes or tonnes per hectare common to most grape regions. (2) Berry-by-berry inspection with strict pass/fail: every single berry must meet the 20 g, Brix 18+, and colour-chart level 3–4 criteria simultaneously; those that do not pass are rejected, creating a relatively high cull rate that concentrates cost into the certified survivors. (3) High cultivation cost per berry: producing berries of 20–30 g+ requires aggressive fruit thinning (leaving very few berries per bunch), individual bunch shading to prevent sun damage, and precise moisture and temperature management — all labour-intensive practices. (4) Opening-auction brand amplification: the annual Kanazawa opening auction reliably generates million-yen lots that get covered by Reuters, BBC and CNN, locking in the 'world's most expensive grape' narrative and reinforcing the price floor for the rest of the season.
What is the difference between Ruby Roman's variety registration year and its first market year?
Ruby Roman received Plant Variety Protection registration No. 15020 in the MAFF database on March 15, 2007. The first commercial shipment to market occurred in summer 2008. The year 2008 is often cited as the 'birth year' of Ruby Roman because it was the first year consumers could actually buy it, but the formal variety registration happened one year earlier in 2007. The breeder's rights are held by Ishikawa Prefecture; the protection term is 25 years from registration for a perennial plant such as grapevines.
Can I buy Ruby Roman outside Ishikawa Prefecture?
Within Japan, department stores in Tokyo, Osaka and other major cities (Takashimaya, Isetan, Daimaru and similar) occasionally carry Ruby Roman in their premium fruit sections during August, as does a small number of luxury fruit specialists. Volume is very limited and sell-outs are common. Farm-direct mail order from Ishikawa is another option, but the challenge is maintaining quality during shipping, and the number of reliable shippers is small. Outside Japan, purchase is effectively not possible. Certified shipments are almost entirely absorbed within the Japanese domestic market, and there is no established regular export channel. Isolated export examples have been reported anecdotally, but Ruby Roman has not been commercialised for international retail. For readers outside Japan who want to experience Ruby Roman, the realistic paths are: visiting Ishikawa during August–September, or commissioning a Japanese-based gifting service to arrange international shipping from a department store.
Which is more premium — Ruby Roman or Shine Muscat?
Ruby Roman is in a different category on both price and scarcity. A top-tier Shine Muscat gift bunch sells for roughly ¥2,000–5,000; a standard certified Ruby Roman bunch starts at several thousand yen and goes well above ¥10,000, with Premium-grade bunches reaching tens of thousands and opening-auction lots exceeding ¥1,000,000 per bunch. Availability is similarly asymmetric: Shine Muscat is sold at premium supermarkets and department stores across Japan from August to November, and in premium Asian-grocery chains outside Japan; Ruby Roman is available only in August and only through a narrow set of channels. For the purpose of enjoying a delicious premium Japanese grape, top-grade Shine Muscat delivers outstanding satisfaction. Ruby Roman exists in a separate register — it is an experience, a story, and an ultra-premium gift object as much as it is a fruit.
For readers in the Northern Hemisphere, how should I think about Ruby Roman's seasonality?
Ruby Roman's season runs July to September, with peak from mid-August to early September — aligning with peak summer in the Northern Hemisphere. This means the timing coincides with the season when European and North American grapes are also coming into their own, making July–August a globally recognisable 'grape season' context. However, the tiny certified volume means being 'in season' does not translate into availability outside Japan. For readers in Japan, early-to-mid August is the optimal window for peak-quality certified stock. For readers outside Japan, the season information is useful context for understanding the auction news cycle — but unless you are planning to visit Ishikawa or commission a Japanese gifting service, the timing does not open up purchase access.