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- Cassis (ornuta) pearl is a non-nacreous pearl. This means it's made without nacre.
- Technically, it shouldn't be classified as a pearl. Rather, it's should be classified as calcareous concretions. However, many still call them pearls for convenience.
- They come from Cassis cornuta or horned helmets, a species of large snails.
- The snails, as well as cassis pearls, are found in the Red Sea, Indian Ocean, souther African coast, and the Pacific Ocean.
- Horned helmet shells are very popular among collectors, which has led them to be an at-risk species.
- Cassis pearls have flame structures. These are caused by fibrous aragonite that form variant band or spindle patterns.
- Cassis pearls come in yellow, orange, white, and brown colors.
- The formation of non-nacreous pearls are similar to nacreous pearls. It starts when a foreign object get stuck inside shellfish and it secretes liquid around it as a defense mechanism. But instead of nacre, it creates concentric layers around the nucleus.
- The main material non nacreous pearls is calcite.
- Nacreous pearls, on the other hand, are made with aragonite.
- Non-nacreous pearls are less durable than nacreous pearls and are prone to cracking.
- Pearls are birthstones for June. They are also the national gemstone of the Philippines.
- The name pearl comes from the Latin world perna meaning "leg". This is in reference to the ham-leg shape of the bivalve mollusk.
- Pearls metaphysically represent purity, integrity, and loyalty. It gains one wisdom from experience and help cement engagements and love.g.
- Pearls with yellow colors represent creativity, cheerfulness, happiness, optimism, wealth, friendship, clarity, perception, motivation, learning, health, and brightness.