Only a little over 100 complete pieces of Song Dynasty Ru Porcelain (also know as Ru ware, Ruyao or Ru kiln) exist in the world today, most housed in the Palace Museum in Beijing, the National Palace Museum in Taipei, and the British Museum. For nearly a millennium, this ethereal sky blue porcelain has been hailed as “the crown of Chinese ceramics”—revered by emperors, collectors, and artists across the globe. But what truly makes Ru Porcelain so extraordinary, and how can you bring its timeless, calming beauty into your daily life?

What Is Ru Porcelain? A Brief History

Ru porcelain stands as the most celebrated of China’s Five Great Kilns from the Northern Song Dynasty (960–1127). It was originally crafted exclusively for the imperial court in Ruzhou, Henan Province—the only place on Earth where authentic Ru Porcelain has ever been produced.

Its story is as enchanting as its hue. Legend has it that Emperor Huizong, a passionate artist and patron of the arts, dreamed of the sky just after a rainfall. Upon waking, he issued an imperial decree: “Create for me the color of the sky when rain breaks through the clouds.” For years, potters across China tried and failed—until the master artisans of Ruzhou perfected the formula, using local clay and rare agate in the glaze.

Ru Porcelain was made solely for the emperor for a mere 20 years (1086–1106). Commoners were forbidden from owning it, on penalty of death. Then, in 1127, the Jin army invaded northern China, the Song court fled south, and the Ru kilns were destroyed. The secret of the sky blue glaze was lost for nearly 800 years.

It wasn’t until the 1950s that Chinese archaeologists and master potters rediscovered the original kiln sites in Ruzhou and painstakingly recreated the traditional 72-step production process. Today, authentic Ru Porcelain is still crafted exclusively in Ruzhou, where our artisans adhere to the same techniques perfected a millennium ago.

The 4 Unique Features That Make Ru Porcelain Irreplaceable

No other ceramic in the world can replicate the delicate beauty of authentic handcrafted Ru Porcelain. Its magic lies in four irreproducible characteristics:

1. The Iconic Sky-Blue Glaze (Made With Agate)

The defining feature of Ru Porcelain is its soft, luminous sky blue glaze, created by adding finely ground agate to the clay mixture. This rare ingredient gives the glaze a chameleon-like quality—it shifts color with the light: pale blue on sunny days, soft gray-blue on cloudy days, and a warm jade hue under indoor lighting.

Unlike mass-produced ceramics with uniform industrial colors, every piece of Ru Porcelain boasts a slightly unique shade. No two are identical—each is a one-of-a-kind work of art, shaped by fire and the natural elements.

2. Cicada-Wing Crackle: A “Flaw” That Is Its Greatest Beauty

Look closely at a piece of Ru Porcelain, and you’ll spot a network of fine, hairline cracks across the glaze, known as “cicada-wing crackle.” This is no defect—it is the very soul of Ru Porcelain.

Crackle forms naturally during the cooling process, when the glaze contracts faster than the clay body. Over time, as you use your Ru Porcelain, tea and water will gently seep into these cracks, creating golden-brown lines that tell the story of your daily rituals. This process, called “nurturing the crackle,” makes your piece more beautiful and personal with every use.

3. Sesame-Seed Nail Firing

Authentic Ru Porcelain is fired using the ancient “sesame-seed nail” technique. Artisans place the piece on three to five tiny, sesame-sized supports during firing, ensuring the glaze covers nearly the entire surface—even the bottom.

This leaves only three to five tiny, unglazed spots on the base, known as “sesame nails.” This is the signature of traditional Ru Porcelain, a sure sign your piece was handcrafted, not mass-produced.

4. A Texture Like Polished Jade

Ru Porcelain features a soft, matte glaze that feels like polished jade to the touch. It doesn’t glare or reflect harsh light, making it incredibly calming to look at and hold. In a world filled with bright screens and loud colors, Ru Porcelain offers a quiet, peaceful escape—a gentle reminder to slow down and savor the moment.

Modern Ru Porcelain vs. Song Dynasty Ru Porcelain: What You Need to Know

Many people assume all Ru Porcelain is ancient and unaffordable. That’s not the case. Here’s a clear breakdown of the differences: 

 Why Ru Porcelain Deserves a Place in Your Home

Ru Porcelain is more than just a ceramic—it’s a way to bring 1,000 years of Chinese art and philosophy into your daily life. Here’s why our customers love it:

- Elevates everyday rituals: A morning cup of tea or coffee becomes a moment of peace when served in a Ru Porcelain cup.

- Matches any decor: Its soft sky blue color complements every style, from Scandinavian minimalism to Japanese wabi-sabi to modern farmhouse.

- Healthy and safe: Fired at 1,300°C, Ru Porcelain is completely lead-free and cadmium-free—safer than most commercial ceramics.

- A meaningful gift: Far more personal than a generic luxury item, Ru Porcelain is a gift that will be cherished for generations.

- Appreciates in value: Handmade Ru Porcelain increases in value over time, making it a beautiful investment as well as a functional piece of art.

Frequently Asked Questions

Is the crackle on Ru Porcelain a defect?

No, the delicate crackle on Ru Porcelain is absolutely not a defect. It is the most prized characteristic of genuine Ru Porcelain, formed intentionally during the high-temperature firing process. Each piece develops a unique, one-of-a-kind crackle pattern that will gently evolve over time with use, making your item truly personal.

Is Ru Porcelain safe to use every day?

Absolutely. Ru Porcelain is fired at extremely high temperatures, making it non-porous and fully food-safe. It’s perfect for tea, coffee, and all cold and hot beverages.

How do I “nurture” the crackle?

Simply use your Ru Porcelain regularly. Over time, tea and water will naturally seep into the cracks, creating beautiful golden lines. There’s no need for any special steps—just enjoy using it.

Bring a Piece of the Sky Into Your Home

Ru Porcelain is a reminder that the most beautiful things in life are not perfect—they are unique, handcrafted, and steeped in history. It’s not just something you own; it’s something you live with, something that grows more beautiful with time.

Explore our collection of handmade Ru Porcelain tea ware, incense ware, and vases, and find your own piece of the sky after rain.