Diamond professionals use the grading system developed by GIA in the 1950s, which established the use of four important factors to describe and classify diamonds: Clarity, Color, Cut, and Carat Weight. These are known as the Four C s. When used together, they describe the quality of a finished diamond.
0. Most Americans adjust their clocks for Daylight Saving Time (DST) once in the spring and once in the fall -- but residents of two states, Hawaii and Arizona, have chosen not to observe it. This clocks stands in a city park in Glendale, Arizona. Wikimedia Commons. Arizona participated for one summer.
Current Dates and Times across USA. Across the United States of America, Daylight Savings Time is now in effect. Daylight Saving Time is not observed in Hawaii, and by most of Arizona. In summer, local time in Arizona is the same as Pacific Daylight Time (PDT). In the winter Arizona is on Mountain Standard Time (MST). Alaska (AK) 90% of Alaska is (1 hour) behind the Pacific Time Zone, while the far reaches of the Aleutian Islands use Hawaii-Aleutian time.