Necklace length is around 20 inches in Nickle-free Iron. It can be changed if requested in personalization. Does come with extender link so can be adjusted about an inch each time you wear. Closure is lobster clasp. Scorpio Tree is made with Obsidian, Turquoise, and Lava Stone. Note that each set is made with unique stones and may look slightly different. Disclaimer: These gemstones are not guaranteed to have the desired effect for everyone and do not replace the need for doctor’s care. Do not ingest any part of the jewelry including any herbs.