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
Mason S. Stone Montpelier's Green Mount Cemetery. Stone also authored several books, including a history of education in Vermont. Mason S. Stone Mason Sereno Stone (December 14, 1859 – July 13, 1940) was a Vermont educator who served as state Superintendent of Education. From 1919 to 1921 he was Lieutenant Governor of Vermont. Mason Sereno Stone was born in Waterbury Center, Vermont on December 14, 1859. He worked as a teacher, principal and school superintendent, and received a bachelor's degree in 1883 and a master's degree in 1909, both from the University of Vermont. He served as Vermont's Superintendent of Education from 1892