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these calcite ammolite specimens are semi polished.

Ammolite is a unique and valuable gemstone that is formed from the fossilized shells of ancient sea creatures known as ammonites. These creatures lived approximately 70 million years ago and are related to modern-day cephalopods like squids and octopuses.

The iridescent, rainbow-colored appearance of ammolite is caused by the microscopic layers of aragonite crystals that make up the gemstone. The colors can range from red and green to blue and violet, and they change as the stone is viewed from different angles.

Ammolite is primarily found in the Bearpaw Formation, which stretches across Alberta, Canada, and parts of Montana, USA. It is considered one of the rarest gemstones in the world due to its specific geological requirements and the fact that it is only found in a few select locations.

Because of its scarcity and striking appearance, ammolite is often used in jewelry, particularly in pendants, earrings, and rings. It is typically set as a cabochon (a smooth, rounded gemstone) to showcase its vibrant colors.

When working with ammolite, it's important to handle it with care, as it is a relatively soft gemstone. It should also be protected from exposure to harsh chemicals and extreme temperatures.