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.
Enstatite is a rare gemstone that belongs to the pyroxene group of minerals. It is typically brown-green with a vitreous luster and is a collector's gem. Sphene. Sphene is a brilliant yellowish-green, green or brown gemstone of high luster, unique color shades and, with brilliant cut, an intense fire.podumene is a relatively new mineral to science, with gem varieties discovered only in the last 120 years. Spodumene occurs in white, gray, pink, lilac and green. Fluorite. Fluorite is a mineral with a veritable plethora of brilliant colors that include purple, blue, green, yellow, colorless, brown, pink and orange.