This stone is a shockingly beautiful color. Made of micro faceted chalcedony topped with gold plated decorative cap and 14k gold filled chain.The length is 18". The stones alone are a plump 16-18 mm. There is a matching pair of earrings available. https://www.etsy.com/listing/126564889/fresh-air-bright-blue-chalcedony This listing is for the necklace only.