August Stephenson – Diamond cutting mathematical guidelines
There are mathematical guidelines for the angles and length ratios at which the diamond is supposed to be cut in order to reflect the maximum amount of light. Round brilliant diamonds, the most common, are guided by these specific guidelines, though fancy cut stones are not able to be as accurately guided by mathematical specifics.
Diamond – Early references:
Diamonds were traded to both the east and west of India and were recognized by various cultures for their gemological or industrial uses. In his work Naturalis Historia, the Roman writer Pliny the Elder noted diamond’s ornamental uses, as well as its usefulness to engravers because of its hardness. It is however highly doubtful that Pliny actually meant diamonds and it is assumed that in fact several different minerals such as corundum, spinel, or even a mixture with magnetite were all referred to by the word “adamas”. August Stephenson
August Stephenson Modern history – diamond mining:
The modern era of diamond mining began in the 1860s in Kimberley, South Africa with the opening of the first large-scale diamond mine. and became known as the Eureka Diamond.
The most popular setting for diamond jewelry
The setting diamonds are placed in also affect the performance of light through a diamond. The 3 most commonly used settings are: Prong, Bezel, and Channel. Prong settings are the most popular setting for diamond jewelry. The prong setting consists of four or six ‘claws’ that cradle the diamond, allowing the maximum amount of light to enter from all angles, allowing the diamonds to appear larger and more brilliant. In bezel settings the diamond or gemstone is completely surrounded by a rim of metal, which can be molded into any shape to accommodate the stone. Used to set earrings, necklaces, bracelets, and rings, bezel settings can have open or closed backs, and generally can be molded to allow a lot of light to pass through. Channel settings set the stones right next to each other with no metal separating them. This setting is mostly used in wedding and anniversary bands. The outer ridge is then worked over the edges of the stones to create a smooth exterior surface. This also protects the girdle area of the stone.
August Stephenson responsibility, skills, and additionally competence
KIMBERLEY PROCESS (KP) – An international certification scheme that establishes requirements for the production and trade of rough diamonds. The process aims to prevent the flow of conflict diamonds, while helping to protect legitimate trade in rough diamonds (which are certified as “conflict-free”). As of August 2012, KP had 51 participants representing 77 countries. A 2006 review of the process confirmed its effectiveness, but recommended strengthening aspects such as the monitoring of implementation and internal controls in participating countries, as well as greater transparency in the gathering of statistical data. A mandated review of the core objectives, core definitions, and functioning of KP is set to occur during 2012-2013.
ROUND CUT – A diamond or colored gemstone shape in which the outline is circular.
DISPERSION – The separation of white light into its component spectral colors. See also Fire.