Scroll to see break-even price per barrel for oil in 2015 for select oil producers, and click on a country's name for more details. modest oil-price recovery and currency devaluations have lowered breakeven prices for countries like Russia and Nigeria, but some petrostates still need oil prices above $100 a barrel to balance their budgets.
There are dozens of types of gemstones â including diamonds, colored gemstones, and pearls â each with a unique set of physical and optical properties. GIRDLE â The narrow band around the perimeter of a polished or faceted diamond or colored gemstone.
1 The gemstone's principle color is a reddish brown and the red variety called Pyrope is the best known garnet. 2  Garnet is not a specific gemstone. 3  Rather, it is a group of common silicate minerals that have similar structures and components. Many of these gemstones are a deep yellow, but can be light or dark yellow, a golden orange and a brown orange. 2  Citrine is a transparent quartz that gets its yellow color from iron. 3  It usually has excellent clarity and few inclusions.