Small Sterling & Gold-Filled Moonstone Necklace

This is an artisan-crafted faceted, oval-shaped moonstone w./gold-filled and sterling components.Purchased from artist @ the Union Sq Winter Craft Fair for about $150.The necklace has 1 gold-filled ring just above the moonstone & c-clasp w./extender chain findings (Pics 2-4).It has an 18" rolo link sterling chain.The clasp has small marks which I can't make out & there are no other markings on the piece since it handmade but it is definitely sterling.Has some hairline scratches in setting.