Raw herkimer diamonds aren't actually diamonds. They are double-terminated quartz, naturally occurring crystals that have two points instead of the usual one. Beautiful and clear, these handmade necklaces will make you sparkle! Raw herkimer pendant is available in small (approximately 0.5 inches long), medium (approximately 0.75 inches long) and large (approximately 1 inch long). Small pendants come with a 16 inch sterling silver chain, other sizes come with a sterling silver 18 inch chain.