The Exceptional Ring of Yusuf Karimasson is a 2864 years old piece made by Yusuf Karimasson, a jeweler living in Isfahan.
Considering its age and the quality of the work, people consider it of priceless value.
It is engraved with central asian patterns and some symbols pertaining to Sufism.
This piece doesn't exist, but as a legend. It is said that in the year 657, Soteira Karimasson, the owner, made use of it in Lisbon to empower the Karimasson family. Now it is lost, or broken, we will never know.