Handwoven 22-kt Gold Chains, available in any length. 

Top: Hellenistic Silver Tetradrachm of Alexander the Great (336-323 BC).
Quadruple loop-in-loop chain. 

Center: Byzantine Gold Solidus of Justinian I (AD 527-565). Set with cabochon emerald. 
Double loop-in-loop chain. 

Bottom: Imperial Roman Bronze Follis of Maximianus I (AD 286-305). Set with cabochon ruby. 
Sailor's knot chain.