15” rock crystal beaded, with faceted onyx necklace on a 10k yellow gold chain!

I was a little surprised to see the 10k stamped on the clasp! Marked 10k, and signed "Esemco”, 15" inches long. The clear crystals are 12mm and faceted. I was also surprised to learn that the spacers in the middle were faceted onyx! So the crystal/onyx are strung on a 10k yellow gold chain. This is a heavy necklace! Similar ones online are really high priced ($895+) One of the clasps is NOT 10k. It looks like it was replaced at some point. Very vintage and very art deco 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 💎