In the Greek system in American colleges, it refers specifically to a necklace bearing a fraternity's or sorority's letters. An accepted gift of a lavalier, called lavaliering, indicates a romantic commitment that may develop into a long term engagement, and marriage. Jul 14, · A Greek lavalier is a pendant necklace whose name is derived from the Duchess Louise de La Valliere, a mistress of King Louis XIV. Popular in the American Greek system, today the lavalier is given as a sign of commitment and affection from a member of a fraternity to his girlfriend. More than a necklace, the Greek lavalier is often a predictor. Phi Delta Theta Sterling Silver Lavaliere with simulated Diamonds / ΦΔΘ Fraternity Jewelry / Fraternity Lavaliere / Fraternity Gifts / Greek CollegiateStandard. 5 out of 5 stars (1,) $ Add to Favorites Mens Beaded Bracelet, omega psi phi, purple and gold, fraternity, beaded bracelet, mens jewelry.