σφραγίς

Etymology
Formation similar to and  which points to a secondary derivative. Prellwitz suggested connection with 🇨🇬 and 🇨🇬, but this is semantically enigmatic. Furnée takes the word to be because of the suffix "-ῖδ-".

Noun

 * 1) seal, signet
 * 2) gem or stone for a ring
 * 3) tablet of Lemnian earth
 * 4)  pastille