Vintage Sigrid Olsen signed genuine prehnite stone 18” necklace

This is beautiful! It has some really good weight to it! Brass tone toggle clasp with the signature "Sigrid Olsen" on it. There are brass tone beads throughout. Each olive green stone, possibly prehnite, is about 14x19mm a piece. Kind of look like agates to me. 18" long. It is vintage so there will be some wear to it. Please inspect and enlarge the pictures to assess the condition of the item for yourself. Please ask any questions you might have. Vintage/Pre-owned/antique items are being sold as is. Pictures are not altered and colors have not been adjusted. Due to technical reasons, colors may appear differently on your electronic devices. Pictures may also be enlarged to show better detail. 💎gemstone, 14k, 10k, 18k, sterling, silver, gold, estate, ring, pendant, earrings, loose, natural, stone, genuine, synthetic, lab, diamond, moissanite, vintage, real, gemstone jewelry, engagement, anniversary, promise, wedding, plated, gem, necklace, brooch, fire, crystal, jewel, gift, authentic, collectable, affordable, tested, luxury, natural, opal, emerald, aquamarine, topaz, sapphire, tourmaline, zircon, spinel, investment, ruby, alexandrite, stamped, investment 💎