Oct 19 2026
Ryukyu Glass: Okinawa’s Unique Bubble Glass Craft (History & Care Guide)
Thick-walled, brightly colored, and scattered with tiny trapped bubbles, Ryukyu glass (also called Okinawan glass) looks nothing like the clear, precise glassware most people picture when they think of fine glasswork. That organic, rustic texture is precisely what makes it special. It comes from a specific, fairly recent history, and once you know it, the glass itself reads differently.
This guide covers what Ryukyu glass actually is, where its signature look came from, how it’s made today, and how to take care of a piece if you own one.
What Is Ryukyu Glass?
Ryukyu glass is a style of glassware made in Okinawa, Japan, known for three visible traits: a thick, slightly uneven body, vivid color, and small bubbles trapped throughout the glass. Each piece is hand-blown, so no two pieces come out quite the same, even within the same product line.
That combination of thickness, bubbles, and color isn’t a stylistic choice made from scratch — it comes directly from how the craft developed, which is worth understanding before anything else.
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A Relatively Young Craft, Not an Ancient One
It’s easy to assume that a glass craft this closely tied to a specific region of Japan must be centuries old, but that’s not quite accurate, and it’s worth being precise about what’s old and what isn’t.
Glassmaking itself has existed in Okinawa in some form for a long time — there’s a record of a glass eye being used in a Buddhist statue in Naha in 1690, for instance. Glass production as an actual local industry began later, in the mid-Meiji era (roughly the late 1800s to early 1900s), when glassworkers from Osaka and Nagasaki brought mold-blowing techniques to Naha to make everyday clear glass items like lamp covers and medicine bottles.
The distinctive style known as Ryukyu glass today — thick, bubbly, and colorful — is younger still, and dates specifically to the post-World War II reconstruction era. Naha’s glass workshops were largely destroyed in the city’s air raids in October 1944, and in the postwar years, raw materials for glassmaking were scarce. Local glassworkers began melting down glass bottles
discarded by the U.S. military, including Coca-Cola and beer bottles, and recasting them into new glassware to meet demand from military personnel and, later, tourists.
That recycled glass, full of impurities from mixed-together bottles, naturally produced bubbles and an uneven thickness; by conventional glassmaking standards, these would usually be considered flaws. Instead, these qualities were received as a distinctive, rustic look, and that aesthetic became the foundation of Ryukyu glass as it’s known today. The craft was officially recognized as a Traditional Craft of Okinawa Prefecture in 1998. So while glassmaking in Okinawa has roots going back centuries, Ryukyu glass as a named, recognizable style is a 20th-century development, not an ancient one.
Why Ryukyu Glass Looks the Way It Does
The bubbles and color that define Ryukyu glass started as a side effect of using recycled glass, but today they’re produced more deliberately, even as some workshops still use recycled glass as part of their process.
To create bubbles intentionally, glassworkers add a small amount of baking soda (sodium bicarbonate) to the molten glass and stir it in. This produces fine bubbles that scatter light and give the glass its characteristic cloudy, textured look, similar to carbonation in a drink. Colors, meanwhile, often take inspiration from Okinawa’s surroundings: deep blues and greens reminiscent of the sea and coral reefs are especially common, alongside the greens and ambers originally inherited from recycled bottle glass.
Every piece is still shaped using mouth-blown glassblowing techniques, generally with at least two people working together on a single piece. Because of this hands-on process, slight variation in shape, thickness, and bubble pattern between individual pieces is normal and expected, rather than a defect.
Caring for Ryukyu Glass
Most Ryukyu glass is made from ordinary soda-lime glass rather than heat-resistant glass, and workshops that sell it generally recommend the following, unless a specific piece is explicitly labeled as heat-resistant or dishwasher-safe:
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Avoid sudden temperature changes: Do not pour hot liquids into a cold glass, or vice versa — this is the most commonly cited cause of cracking.
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Do not use in microwaves or ovens: Standard Ryukyu glass is not heat-resistant, and direct flame should be avoided as well.
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Hand-wash gently: Use lukewarm water, a mild detergent, and a soft sponge instead of a dishwasher, whose hot water, water pressure, and heated drying cycle can all put stress on hand-blown glass.
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Dry thoroughly by hand: Avoid air-drying, since residual moisture can leave marks that are difficult to remove later.
If a specific piece is labeled heat-resistant or dishwasher-safe, that labeling should take precedence over these general guidelines — but when in doubt, treating any given piece as ordinary, heat-sensitive glass is the safer assumption.
Where Can You Buy Ryukyu Glass?
Ryukyu glass is sold through a few different channels: specialty shops and workshops in Okinawa, online stores, and select shops on mainland Japan that carry regional craft goods. Buying directly from a workshop or a specialty retailer is generally the more reliable way to confirm which pieces are hand-blown by a specific maker, as opposed to mass-produced glassware sold more generally as a souvenir item.
Takumi Kobo is one example of a workshop whose Ryukyu glass collection is also available to browse online, for anyone who wants to see a range of hand-blown pieces without visiting Okinawa in person.
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A Craft Built From Making Do
Ryukyu glass is a useful reminder that not every craft tradition stretches back centuries to be worth taking seriously. Its defining look came directly out of postwar scarcity — melted-down bottles, improvised materials, and workshops rebuilding from very little — and the bubbles and uneven thickness that once marked a shortage of proper materials are now the very things collectors and everyday users look for. That history is part of what makes each piece worth holding onto.