Aeronautics (from the ancient Greek words á½°Î®Ï ÄÄr, which means air, and Î½Î±ÏÏÎ¹ÎºÎ® nautikÄ which means navigation, i.e. navigation into the air) is the science or art involved with the study, design, and manufacturing of air flight capable machines, and the techniques of operating aircraft and rockets within the atmosphere.
Diamond-like substitutes, including cubic zirconia, a crystalline compound synthesized from the elements ziconium and oxygen, attempt to mimic this light-dispersing property, though they fall short of diamond's brilliance and unrivaled hardness.
DIAMOND CLARITY. Diamond Clarity Refers to the Absence of Inclusions and Blemishes. Natural diamonds are the result of carbon exposed to tremendous heat and pressure deep in the earth. This process can result in a variety of internal characteristics called âinclusionsâ and external characteristics called âblemishes.â.