Midnight Constellation Jianzhan Gaiwan and Cups

A striking, high-fired Jianzhan set with classic oil-spot crystallization. The deep, iron-rich glaze frames tea liquor beautifully and the heavier walls hold heat for steady infusions. Buy the gaiwan and cups together or pick them up separately.

Jianzhan is a high-fired stoneware born in the Jianyang kilns of northern Fujian during the Song dynasty. Famous for tea culture at the time, these thick, iron-rich bowls were prized for whisked tea competitions; their dark interiors made the foam glow and the heavy walls held heat. Large quantities traveled to Japan, where they were treasured as “tenmoku,” shaping early Japanese tea aesthetics. Classic patterns include hare’s fur, oil spot, and partridge feather, all the result of how iron behaves in the kiln.

The process starts with local clay naturally rich in iron, thrown thick for strength and heat retention. Potters apply an iron-saturated glaze, then fire in a wood or gas kiln to around 1,300°C in a reducing atmosphere. At peak heat the iron dissolves into the glaze; as the kiln soaks and then cools, iron segregates and crystallizes, creating the silver or bronze flecks and streaks that define Jianzhan. Minute changes in glaze recipe, atmosphere, temperature curve, and cooling speed make each piece unique, which is why even a matched set will show individual character.

Why it’s special

• Authentic Jianzhan look: silver-blue oil spots over a black ground with natural iridescence.

• Heat-holding clay and thicker walls keep extractions stable and aromatic.

• Dark interior makes colors pop. Great for oolong, black tea, and pu-erh tastings.

• Each piece is unique; patterns vary from cup to cup.

Details

• Material: high-fired stoneware with iron-rich Jianzhan glaze

• Finish: oil-spot crystallization inside and out; potter’s seal on the base of cups

• Gaiwan capacity: about 130 ml to the brim (practical brew 90–110 ml)

• Cup capacity: about 60–70 ml to the brim

• Feel: smooth rim, comfortable lid button, balanced weight

Tea pairing

• Works especially well with Wuyi Rock oolongs (yancha), Dan Cong, Anxi oolongs, Dianhong (Yunnan Black Tea), and both ripe and raw pu-erh teas.

• For aroma-forward teas, keep early steeps short; the heat retention will carry aroma into the cup.

Care

• Hand wash recommended; avoid abrasive pads.

• Do not shock with sudden temperature changes (e.g., freezer to boiling water).

• As with all crystalline glazes, small variations and pinholes are normal and part of the character.

Purchase options

• Gaiwan (130 ml to the brim)

• Cups (60–70 ml to the brim)

• Full set: 1 gaiwan + 2 cups

In short: a handsome Jianzhan brewing setup that elevates color, preserves heat, and brings a touch of Song-style drama to every session, whether you buy the full set or mix and match.