Leaded bronze
1st-2nd century CERomanBrass
5th-4th century BCEGreekBronze
7th century BCEGreekAgate
3rd millennium BCESumerianBluish-white stone
Leaded bronze
3rd century BCEGreekGold
16th centuryGermanCopper alloy
9th-8th century BCEItalicCopper alloy
8th century BCEGreekStone
20th centuryChineseBrass or pewter with two beads covered with azure-hued glaze
AfghanCopper alloy
8th century BCEItalic