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.
1 Aside from the carats, an opal stone can be priced depending on the color, body and the transparency. 2  Rare opal stones such as black cuts can cost upwards of $1,000 per carat. 3  Other colors such as bright blue can cost as much as $600.