Small oval crystal-fronted silver pendant reliquary theca housing the first-class ex ossibus (of the bone) relic of Saint Apollonia. The relic is affixed to a silk ground surrounded by silver wire and paperolle ornamentation and identified in Latin on a manuscript cedula label as S. Apolloniae (Saint Apollonia). On the back, the theca is secured with a perfectly preserved seal of red Spanish wax bearing an imprint of a coat of arms of Monsignor Giulio Maria della Somaglia (†1830), Cardinal-Priest of Santa Sabina (mother church of the Dominican order), Papal Vicar General, and Prefect of the Congregation of Sacred Rites. The theca is accompanied by the original matching authentics documents issued at the Vatican and signed by Monsignor Somaglia in 1807.
Saint Apollonia was one of a group of virgin martyrs who suffered in Alexandria during a local uprising against the Christians prior to the persecution of Decius. According to church tradition, her torture included having all of her teeth violently pulled out or shattered. For this reason, she is popularly regarded as the patroness of dentistry and those suffering from toothache or other dental problems. She is venerated in Catholic Church, Eastern Orthodox Church, and Oriental Orthodoxy, and her feast day is celebrated on February 9.