Hollow gold shank ring with thick shoulders, set with oval orange cornelian intaglio engraved with the bust of Theaetetus of Athens, long curly beard and hair, helmet or mask in the shape of a dolphin over his head. Excellent details. Theaetetus of Athens was a Greek mathematician, c. 417-369 B.C. Size: USA= 8 1/2 - GB= R - 1.9 cm inside D Material: Gold and cornelian, total weight= 11.8 grms Culture: Roman, c. 1st Century A.D. Condition: Intact Provenance: Ex. Collection Mr. R.S., acquired in 2008. The seller guarantees that this item has been legally acquired & will be legally exported, related documents seen by Catawiki. This item do not need an export licence within the EU. The seller will inform the buyer if it needs a UK export licence outside the EU Worldwide shipping by Registered Mail. Comes with a Certificate of Authenticity N.B. Import duties may be incurred on orders shipped to countries outside the UK.