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.
Law Ends Daylight Saving Confusion. All counties in Indiana will observe the daylight saving change on March 9, 2008. However, this state has a controversial history regarding daylight saving time. Many parts of Indiana did not observe daylight saving time prior to 2006. Some counties, such as Floyd, Clark, and Harrison, observed daylight saving time while other counties did not.