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Telephone numbers in area code 678 were first assigned to customers signing up for new telephone service on January 15, 1998. On September 2, 2001, area code 470, was added to the 678 overlay area of area codes 404 and 770. [1] Telephone numbers from the NPA were assigned after exhaustion of area code 678.
Gemological Science International, or GSI, is an independent gemological organization that is one of the largest gemological entities in the world, with offices in four continents. [ 1 ] [ 2 ] [ 3 ]
When it changed to 10 digit dialing people started having to remember area codes all the time. When 770 came out people started writing 7/ as short hand for the area code, so when 678 was introduced it was treated the same way with a 6/. Atlanta had 10 digit dialing before the rest of the country so it's probably not common in most other areas.
In 1953 the GIA developed its International Diamond Grading System and the "four Cs" (cut, clarity, color, and carat weight) as a standard to compare and evaluate the quality of diamonds. [ 2 ] As of 2024, the institute is headquartered in Carlsbad, California , and operates in 13 countries, with 11 campuses, 9 laboratories, and 4 research centers.
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IGI provides independent grading reports, colored stone reports, identification and appraisal reports, diamond authentication and attestations of origin, and laser inscription services. They also offers diamond and colored stone courses through IGI's Schools of Gemology. [7] Graduates from the IGI school of Gemology are awarded an IGI Diploma.
In September 2005, 762 was overlaid to all of the existing area code 706, despite the fact that it has been physically split into two separate and disconnected sections since it was created in 1992. [2] Georgia is served by ten area codes. The newest area code, 943, went into service in March 2022 as another area code for the Atlanta area. [3]
Gemology or gemmology is the science dealing with natural and artificial gemstone materials. It is a specific interdisciplinary branch of mineralogy . Some jewelers (and many non-jewelers) are academically trained gemologists and are qualified to identify and evaluate gems.