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.
A faceted girdle is one where the brillianteer polished facets into the diamond's girdle. An unfaceted, or bruted girdle is one where the diamond's girdle is unpolished and has a frosted appearance. Some cutters believe polishing the girdle may cause color to be reflected back inside, so unfaceted girdles are common in J or K color grades and down, and in small goods, .25 and lower.