The category with the highest number of workers in 2011 comprised the 21.4 million office and administrative support occupations, which had average earnings of $2,843 per month, $34,120 per year or $16.40 per hour.n 2011, food preparation and serving related occupations were the lowest-earning category, earning an average monthly $1,785, which equaled $21,430 per year, or $10.30 per hour.
Blue diamonds are extremely rare. They generally have a slight hint of gray, so theyâre rarely as highly saturated as blue sapphires. Their color is caused by the presence of boron impuritiesâthe more boron, the deeper the blue. Fancy green diamonds are typically light in tone and low in saturation.
All other gemstone corundum colors â orange, yellow, brown, green, blue, purple, violet, black, and colorless â are called sapphires. The Mogok valley of Upper Burma is famous as the source for the finest and rarest rubies of all, know as âpigeonâs bloodâ for the stonesâ intense red color.