Jet Beads also known as "Black Amber Beads" or "Witch's Amber Beads". Jet is a glossy, lightweight and is warm to the touch. Jet is a geological material and is considered to be a minor gemstone. Jet is a product of high-pressure decomposition of wood from millions of years ago. It's not a mineral or stone and due to it's organic nature, Jet may crack so care must be taken with this item.