Gemstone value of the stone. Some treatments are used widely because the resulting gem is stable, while others are not accepted most commonly because the gem color is unstable and may revert to the original tone. Heat can improve gemstone color or clarity. The heating process has been well known to gem miners and cutters for centuries, and in many stone types heating is a common practice. Most citrine is made by heating amethyst, and partial heating with a strong gradient results in “ametrine” – a stone partly amethyst and partly citrine. Aquamarine is often heated to remove yellow tones, or
Neil S. Bishop nominee for U.S. Senate in 1970, which he lost to Edmund Muskie. Neil S. Bishop Neil S. Bishop (1903-February 24, 1989) was an American dairy farmer, educator and politician from Maine. Bishop was born in Presque Isle, Maine, although his family moved when he was young to Bowdoinham, Maine. He served four terms (1940-1948) in the Maine Senate as a Republican while a resident of Stockton Springs, Maine. He unsuccessfully sought the Republican Party nomination for governor in 1948 and 1952. He won the nomination for Congress in the 2nd district in 1958, but lost to incumbent Democrat Frank M.