Bulgari
Bulgari is a subsidiary of luxury conglomerate LVMH (Moet Hennessy•Louis Vuitton).
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The Italian jewelry company lists Mahmoudieh Prestige Boutique, Milad-E-Noor Prestige Boutique, Kooh-E-Noor, and Golestan as authorized retailers in Tehran. (Bulgari Website, "Store Locator," input "Iran")