Gilo and Grace Nakai have been making sterling silver with a special process which draws out the copper from the surface and keeps the silver shinier. The pendant is a cross with 7 opals that has pink and blue flecks in the opals, a little over 7 carats. 3" tall including the bail and 1 3/4" wide and just under 1/4". Marked Nakai and sterling. The necklace is a later addition of 23". Marked Italy. Excellent vintage condition.