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
Gemstone Publishing was a compilation, edited by David Gerstein, of Disney cartoon story pages published from 1934 to 1944 in Good Housekeeping magazine. Gerstein later edited two Gemstone softcover books that were official tie-ins to the Walt Disney Treasures DVD collections: "Disney Comics: 75 Years of Innovation" (2006) and "Uncle Scrooge: A Little Something Special" (2008). Gemstone has also published reprints of EC Comics. Gemstone's "Comic Book Marketplace"-editor Russ Cochran had previously published (in 1973) a dozen reprints of EC titles including "Crypt of Terror", "Weird Science", "The Haunt of Fear", "The Vault of Horror", etc., before moving to Gladstone Publishing and