How to Tell if an Emerald Is Real (with Pictures), · How to Tell if an Emerald Is Real. Many "emeralds" are actually other green gems, green glass, or imitations built from several materials. Conduct several tests before you reach a conclusion one way or the other, since results are not...Diamond, · Diamond is a solid form of the element carbon with its atoms arranged in a crystal structure called diamond cubic. At room temperature and pressure, another solid form of carbon kAnthracite Coal Characteristics and Applications, · Anthracite is considered the cleanest burning coal available. It produces more heat and less smoke than other coals and is widely used in hand-fired furnaces.Some residential home heating stove systems still use anthracite, which burns longer than wood.10 Best Hammer Drills [ 2020 Reviews ], · Unsure on the best Hammer Drill to buy? Smile, as the team of experts at Best of Machinery, have tried and tested each Hammer Drill for Power Source, Chuck Style, Weight and much more. You will find the perfect product for you in our review guide. Updated16 nov the economist by vikash kumar naresh, · The annual cost of operating and maintaining a Nimitz-class carrier is $726m, not least because each has 6,000 people on board, almost twice as many as serve in the Danish navy..