Labradorite Ammonite
Labradorite gemstones usually have a dark base colour with metallic-looking colour plays of blue, green, yellow, and red. This iridescent effect is commonly known as labradorescence, and is named after this stone. It is caused by internal fractures that reflect light back and forth, dispersing it into different colours.
Please note: The photos are of the actual item but due to the nature of how colours appear on different screens the colours may be slightly different in reality.