Peridot is the birthstone for August and the gem for 16th anniversaries. An eye catching bright green gemstone in light to mid tones with a hardness of 6.5 – 7 on Mohs scale. Smaller gems up to 1ct are relatively inexpensive, larger individual gems command much higher prices per carat and can be absolutely breathtaking. Peridot is mined in Myanmar, China, Pakistan and Tanzania. Peridot is doubly refractive with and RI of 1.635 – 1.710, the specific gravity of Peridot is 3.30 – 3.40.