Hallmark(s): "Ugo Piccini" Information: Founded in 1952 by Ugo Piccini, in Florence, Italy. They produce their own designs, but also retail many other jewelry and watch brands. Works primarily in gold.
ULTIMATE TRADING CORPORATION
Hallmark(s): "UTC" Information: Ultimate Trading Corporation was founded in 1985, in Roseland, New Jersey. Works primarily in gold and silver.
Ultimate Trading Corporation
Hallmark(s): "U" with an arrow through it Information: Uncas Manufacturing Co. was founded by Vincent Sorrentino in 1911, in Providence, Rhode Island. Manufacturer of sterling silver and costume jewelry.
UNGER BROTHERS Hallmark(s): "UB" Information: Unger Bros. was founded in 1872 by Herman Unger, in Newark, New Jersey. In 1879, three of the five brothers (William, George and Frederick) died, leaving Herman and Eugene to continue the business. Worked primarily in silver.
Hallmark(s): "UNI D-A" Information: Uni David-Andersen is the great granddaughter of infamous Norwegian gold and silversmith, David Andersen. In 1959, Uni opened her own workshop. Worked primarily in silver and gold.
UNIVERSAL JEWELERS INC.
Hallmark(s): "UJI" Information: Universal Jewelers Inc. was founded in 1973, in Los Angeles, California. The company has since relocated to Miami, Florida. Works primarily in gold and silver.
Universal Jewelers Inc.
Hallmark(s): "Unoaerre", "1 AR" Information: Founded in 1926 by Leopoldo Gori and Carlo Zucchi, making them the 1st registered jewelers of Arezzo, Italy.
UnoAErre was founded in 1925, making them the first registered jeweler of Arrezzo, Italy.