Q. Kvod Rabi Shlit”a. Is there a preference to use a silver becher (cup) for the seder or kiddush when possible?
A. Indeed, if one can afford it, since this is in fulfillment of “Hisna’eh B’mitzvos,” to make a mitzva in a beautiful way, that we derive from the passuk of “Zeh Kaylee V’anvahu.”
(My father Zt”l had the tradition to actually use a real gold becher. He was praised by many of the Rebbes who visited us. Some mentioned that Kabbalistically and traditionally gold is a symbol of Gevuros, and a cup is the Gematria of Elokim which is also Gevuros.
(Lehoros Nasan 4:25; Igros Kodesh 24:225 mentions that the Nishei Chabad gave the Rebbe a gold Becher as a present).