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
George Stone (bishop) George Stone (bishop) George Stone (1708 – 19 December 1764) was the Church of Ireland Archbishop of Armagh (Primate of All Ireland) from 1747 to his death. Born in London, the son of Andrew Stone, a London goldsmith. He was educated at Westminster School and Christ Church, Oxford. Having taken holy orders, his advancement in the Church was very rapid, mainly through the influence of his older brother Andrew Stone. Andrew's connections with George II made him able to promote the preferment of his brother George, who went to Ireland as chaplain to Lionel Sackville, 1st Duke of Dorset when