Marco Bicego. Murano 18k Convertible Double-Strand Necklace. From the Murano Collection. 18-karat yellow gold. Polished and signature Marco Bicego hand-engraved links. Short strand detail may be removed, moved to other links to change length, or worn as a bracelet. Clasps hidden in three links. Long strand, 28"L; 36" if double strand is inserted. Short strand, 8 1/2"L.