color purity ring
61Fach — The German Fach (pl. Fächer, literally compartment ) (pronounced|ˈfax, IPA| [ˈfɛçəɐ] ) system is a method of classifying singers, primarily opera singers, by the range, weight, and color of their voices. It is primarily used in Europe, especially …
62Hal Jordan — Superherobox| caption=Hal Jordan as Green Lantern Art by Ethan Van Sciver character name=Green Lantern publisher=DC Comics debut= Showcase #22 (October 1959) creators=John Broome Gil Kane alter ego = Harold Hal Jordan species = homeworld =… …
63Sunstone — For other uses, see Sunstone (disambiguation). Sunstone General Category Crystal Chemical formula …
64Diamond flaws — Contents 1 External flaws 1.1 Blemishes 1.2 Scratches 1.3 …
65Oxygen — This article is about the chemical element and its most stable form, O2 or dioxygen. For other forms of this element, see Allotropes of oxygen. For other uses, see Oxygen (disambiguation). nitrogen ← oxygen → fluorine ↑ O ↓ …
66Diamond enhancement — Diamond enhancements are specific treatments, performed on natural diamonds (usually those already cut and polished into gems), which are designed to improve the gemological characteristics and therefore the value of the stone in one or more ways …
67Agate — For other uses, see Agate (disambiguation). Agate Banded agate (agate like onyx); the specimen is 2.5 cm (1 inch) wide General Category …
68Brass — For other uses, see Brass (disambiguation). Brass die, along with zinc and copper samples. Brass is an alloy of copper and zinc; the proportions of zinc and copper can be varied to create a range of brasses with varying properties.[1] In …
69Obsidian — For other uses, see Obsidian (disambiguation). Obsidian Obsidian from Lake Cou …
70Mourning — Not to be confused with Morning. Margarita Teresa of Austria, Holy Roman Empress, in mourning, 1666; her brother, the young king Charles II of Spain appears behind her with his attendants wearing mourning dress …
