17.7 inches, and adjustable as shown in photo 6 Crafted in solid platinum with genuine sparkly clean diamonds!! A combination of baguette and round Some Photos ARE zoomed in. View size comparison photos before purchasing . . Photos 3-4 shows caliper and coin showing exact mm top to bottom. view these Photo 7 shows platinum stamp . The necklace is roughly .42ct. It’s stamped .30ct for the baguettes not including the other , so total is roughly .42ct No paperwork, but with that said it’s guaranteed to be as described Perfect for every day wear Same day ship Gift box included for free( always!!) I have a ton of 10k, 14k, , Kay jewelers , zales , vintage , , white gold. Rose gold, yellow gold , gemstones , wedding rings Art Deco fine jewelry,engagement/wedding ring . Solid gold diamonds , opals,Ruby’s,emerald,gemstones listed currently here!! Absolutely gorgeous Gift box included Again photos are zoomed