Yes bhai, here is the proof of what i have been saying …check this please
Incidentally, the Shi’ah sect expresses exceptional honor and gratitude, even in the 21st century, for the person, who murdered Umar-e-Farooq, the second caliph, as per their perverted and besmirched history. Though his given name was Feroz, yet the Shi’ah community honored him with the title of Abu L’u-L’u [dad of diamond] for his meritorious service of killing the closest friend of Mohammad, according to their profusely corrupted annals.
He lies buried in a mausoleum recognized as that of Baba L’u- L’u, situated in the city of Qum, and is considered much more venerable as compared to those of Najaf and Karbala. **The Shi’ah come visiting that shrine from all over the world, and pay rich tribute to him, by buying and wearing silver rings studded with cheap beryl [Aluminum Silicate] type gemstone called Feroza, named after him. Almost every Shi’ah wears the Feroza ring as a tribute to Abu L’u-L’u, and simultaneously cursing, or hurling Tabarra, primarily, upon Umar, and all others noble and stalwart companions of Mohammad.
Source :Akhtar Sherazi