I have tons of Peridot, and it is my birthstone also. I have shared all the jewelry I have made with Peridot, in previous posts. So I am showing some loose stones today. This is just a small parcel, I have tons more.
Cleopatra was a huge fan of Peridot. She had many exotic pieces of jewelry with it. She thought it was Emeralds though LOL, but it has been shown it was in fact Peridot. Peridot can be quite ugly, to be frank, but there is gem quality Peridot out there, and it is relatively inexpensive compared to Emeralds. These pieces are exceptionally clean with lovely color.
Peridot is a 6 1/2-7 on the Moh's hardness scale, and is very brittle internally. That means it can chip, and crack easily, especially when setting the stone in jewelry. Peridot can be found in Arizona, Australia, Brazil, China, Kenya, Mexico, Sri Lanka, South Africa, Tanzania, and Norway. Some Peridot have a lily pad inclusion, and can be visible with a 10x loupe. This inclusion actually will increase the value of your Peridot. Peridot can resemble many gemstones, on the market. There is both synthetic, and simulant Peridot available. Peridot is a completely natural gemstone requiring no treatments. I have never personally seen these, but there is Star Peridot, as well as Cat's Eye Peridot.