Top Left: Parthian Silver Staters of Gotarzes II (AD 40-51). Set with cabochon emeralds and sapphires. 

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Top Right: Imperial Roman Silver Denarii of Alexander Severus (AD 222-238). Set with cabochon rubies. 

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Bottom Left: Imperial Roman Silver Denarii of Tiberius (AD 14-37). 

Bottom Right: Imperial Roman Silver Denarii of Caracalla (AD 198-217). Set with cabochon sapphires.