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.
For residents of the United States, Hawaii is in the Hawaii-Aleutian Time Zone, often just called the Hawaii Time Zone, and abbreviated (HST). No Daylight Saving Time in Hawaii Hawaii does not observe daylight saving time, so the time difference between Hawaii and all mainland areas that do observe daylight saving time varies depending on the time of year.