irregular: 4.1 cm (1 5/8 in.)
Blackened gray earthenware
3rd millennium BCEChineseHigh-fired gray earthenware
3rd millennium BCEChineseTerracotta
GreekTerracotta
5th century BCEGreekCeramic
JapaneseCeramic
KoreanLongquan celadon ware: pale gray stoneware with lustrous, lightly crackled, transparent, bluish green celadon glaze. From the Longquan kilns in Zhejiang province
12th-13th centuryChineseCeladon ware: light gray stoneware with celadon glaze
12th centuryKoreanTerracotta