7th century
irregular: 6.5 cm (2 9/16 in.)
Carnelian
1st millennium BCE-1st millenium CERomanSilver
3rd century BCERomanCopper alloy
8th century BCEItalicGold
2nd century BCEGreekCopper alloy
1st millennium CEByzantineCopper alloy
7th-8th centuryAvarMetal
20th centuryGermanBronze
6th-4th century BCEIranianStone
EgyptianMixed copper alloy
10th-8th century BCEIranianTortoise shell?
19th centuryBritish