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
Robert S. Kerr (bishop) St John's Church in Barre, Vermont. In 1949 he became rector of Immanuel Church in Bellows Falls, Vermont. He also served as Dean of St Paul's Cathedral in Burlington, Vermont. In 1974 Kerr was elected Bishop of Vermont and retired in 1986. He died in Burlington on November 18, 1988 because of a heart attack. Robert S. Kerr (bishop) Robert Shaw Kerr (16 August 1917 - 18 November 1988) was seventh bishop of the Episcopal Diocese of Vermont, serving from 1974 to 1986. Kerr studied at Trinity College in Connecticut. Later he trained at the General Theological Seminary. Upon graduation,