Top: Byzantine Gold Solidii of Anastasius I (AD 491-518). Set with cabochon rubies and emeralds. 

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Left: Republicn Roman Silver Denarii (2nd - 1st Centuries BC) with the head of the goddess Roma. Set with cabochon rubies and emeralds. 

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Right: Greek Silver Drachms of Alexander the Great (336-323 BC), with the head of Herakles wearing the skin of the Nemean Lion. Set with cabochon rubies, emeralds and sapphires. 

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