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.
how many states dont change their clocks for daylight savings time and who. Arizona (with the exemption of the Navajo Nation) and Hawaii are the only states in the U.S. that do not observe Daylight Saving Time however instead stay on standard time all year long. The federal law that founded daylight time in the United States does not require any area to observe daylight saving time. But if a state decides to observe DST, it must follow the starting and ending dates set by the law.