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Gemstone irradiation is a process in which a gemstone is exposed to artificial radiation in order to enhance its optical properties.High levels of ionizing radiation can change the atomic structure of the gemstone's crystal lattice, which in turn alters the optical properties within it. [1]
The clarity, or purity, of a diamond refers to internal inclusions of the diamond, and is one of the 4-Cs in determining a diamond's value.Common inclusions that appear inside diamonds are black carbon spots and small cracks, commonly referred to as fractures or "feathers", due to their feathery whitish appearance when viewed from above or through the side.
Colored dye or smudges can affect the perceived color of a gem. [citation needed] Historically, some jewelers' diamonds were mis-graded due to smudges on the girdle, or dye on the culet. [citation needed] Current practice is to thoroughly clean a gem before grading its color as well as clarity. [citation needed]
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The grader views the diamond for the first time through the table, studying the culet area of the stone for inclusions. The diamond is then set down and picked up with the tweezers in a table-to-culet hold. In this position, the diamond can be studied from the pavilion side, and the crown side, examining the diamond through each facet for ...
Unlike some types of cancer, skin malignancies are visible to the eye. Unfortunately, their appearance can vary widely. “BCC may present as a pearly pink or red bump that may have broken blood ...
After a round of medication made from iodine and quinine, he observed many differences in the colour of his iris. This observation inspired him to create and publish an atlas in 1893, which contained 258 black and white illustrations and 12 colour illustrations of the iris, known as the Diagnosis of the Eye. [11]
Click through to see the shocking before and after images: The main side effects heroin causes on appearance according to New Health Advisor are: Weight loss due to loss of appetite, or because a ...