The large scope of potential global public health threats is recognized in the revised International Health Regulations (IHR [2005])3 with its all-hazards approach to assessing serious public health threats.
How much is it? On average, a high-quality peridot stone can cost anywhere from $50 to $200+ per carat. Larger peridots that are exported from foreign countries can cost as much as $500+ per carat. Generally, stones mined from Burma, Pakistan and Arizona can command the highest prices.
This is the standard by which all other peridot is graded by. Peridot's clarity is appraised by counting the number of black mineral crystals in it that are visible to the naked eye. Each inclusion present lowers the overall value of the stone by a percentage.