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.
When do you change to daylight savings time? Daylight Saving Time (United States) begins Sunday, March 11, 2012, 2:00am, and ends Sunday, November 4, 2012, 2:00am.Except Arizona and Hawaii. Move your clocks ahead 1 hour â¦ in spring and back 1 hour in fall (Spring forward, fall back) . 5 people found this useful.