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Pearls come from the sea; there are both freshwater pearls and saltwater pearls.
99% out of all pearls are cultured. Normally cultivated pearls in about 2-3 years.
The longer the time the pearls are to grow its better quality. But then the beads are also more expensive.

We tend to talk about the Orient (Luster), Blemish (unevenness), roundness, size and color of the beads.
- Orient has to do with the (somewhat simplified) if you can see a reflection in the pearl or not and if it shimmers in various colors.
More orient fancy & expensive gem - Blemish is the roughness, minor blemish finer and more expensive gem.
- Roundness also have the quality to do. Rounder is finer and more expensive.
- Size matters! Larger bead can mean that it's grown longer and have a better oriented and has a more expensive price.
- Color? Some think the color has significance, but I think it's a matter of taste.

Something to think about when care of pearls is:
- You should put on the beads as the last thing. Spraying with perfume, hairspray, etc. will destroy the beads.
- Keep them dark and cool, sun and heat destroys gems.
- You should strict about them after about 2 years to thread can become bad and go by and if you have knots between each pearl so they can be bad and rub the pearl.
- Do not wear pearls in the pool for chlorine.
- Clean your pearls gently with a dry and clean cloth.

Crystal structure: orthorhombic
Composition: Calcium carbonate, conchiolin, water
Hardness: 3
Density: 2.71
Refractive index: 1.53 to 1.68
Birefringence: None

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