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2. List of Illinois area codes - Wikipedia

   en.wikipedia.org/wiki/List_of_Illinois_area_codes

   In March 2007, an overlay plan was created for NPA 630 adding area code 331, and 779 was added to 815. With the depletion of new numbers in area codes 312 and 773, an overlay of both of them, area code 872, was created in November 2009, beginning ten-digit dialing within the city limits of Chicago. The remaining area without an overlay in the ...

3. Sharpening stone - Wikipedia

   en.wikipedia.org/wiki/Sharpening_stone

   Over time diamond stones will wear out and need to be replaced. The lifespan can be extended by using light pressure and allowing the stone to work. The highest quality diamond sharpeners use monocrystalline diamonds, single structures which will not break, giving them an excellent lifespan. These diamonds are bonded onto a precision ground ...

4. Area code 872 - Wikipedia

   en.wikipedia.org/wiki/Area_code_872

   Area code 872 is a telephone area code in the North American Numbering Plan for Chicago in the U.S. state of Illinois. It is an overlay code for a numbering plan area that comprises those of area codes 312 and 773. The overlay commenced service on November 7, 2009. [1]

5. Novaculite - Wikipedia

   en.wikipedia.org/wiki/Novaculite

   Novaculite, also called Arkansas Stone, is a microcrystalline to cryptocrystalline rock type that consists of silica in the form of chert or flint. It is commonly white to grey or black in color, with a specific gravity that ranges from 2.2 to 2.5.

6. Stonesetting - Wikipedia

   en.wikipedia.org/wiki/Stonesetting

   If one looks at a side view of a round diamond, for example, one will see that there is an outer edge, called the girdle, and the top angles up from there, and the bottom angles down from there. Faceted stones are set by "pinching" that angle with metal. All of the styles of faceted stone setting use this concept in one way or another.

7. ULTRA Diamonds - Wikipedia

   en.wikipedia.org/wiki/ULTRA_Diamonds

   Although market share grew from 1991 through 2000, in 2009, ULTRA filed for bankruptcy for the second time under Chapter 11, Title 11, United States Code. [2] In 2008, sales decreased 10.8%, including an 18.9% sales decrease over the critical holiday season. [3] In 2009, ULTRA emerged from the months-long bankruptcy with a strengthened capital ...