The gorgeous stone you see in these earrings is called Lapis Lazuli. It is known for its deep blue color, and is often characterized by flecks of gold, which are Pyrite. The name comes from the Latin word for "stone" and the Arabic word for "blue". In ancient times, lapis was considered as valuable as gold. Today most Lapis Lazuli comes from Afghanistan. It is a rock, not a mineral, and it has a hardness of between 5 and 6 on the Mohs scale.
Lapis Lazuli is the birthstone of December. It is regarded by many as the stone of friendship and truth. It is said to encourage harmony in relationships and help its wearer to be authentic and give his or her opinion openly. (I can think of a few who would benefit from this!) I think I love it because it reminds me of a starry night sky. That's the hopeless romantic in me talking :)