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.
Sizes below approximately 3 carats are considerably less. The wholesale per carat value of white opal ranges from $8 to $70. Fine stones in any size are rare. Unfortunately, the majority of stones on the market are rather gray or milky and, in the extreme, fall below $10 per carat.