Microdiamond testing is about detecting the presence of microscopic diamonds within a material. Diamonds that are too small to see with the naked eye require special screening methods to confirm their existence in a sample, such as concentrating the diamond particles from the surrounding material and examining them under magnification or with confirmatory spectroscopy. This focus is different from assessing crystal orientation, which is a crystallography task; from judging surface luster, which is an appearance attribute; or from testing for synthetic inclusions, which aims to distinguish natural versus synthetic diamonds. So the main idea is to determine whether tiny diamonds are present in the sample.

In fancy-colored diamonds, the color that defines the stone’s overall appearance is called its characteristic color. This is the base color you’d identify first when looking at the diamond, and it serves as the reference for describing any additional hues or color modifiers that may be present. For example, a diamond with a pink base that also shows faint purplish tones would have pink as its characteristic color, while the other colors are noted as secondary hues. The other terms don’t describe the base color: a bruise isn’t a standard color term, Central Selling Organisation is unrelated, and bruting is a cutting process. So the best term for the basic color is characteristic color.

In diamond trade terminology, a diamantaire is a seasoned dealer or manufacturer who has deep knowledge of the market, extensive experience, and a proven track record of success in buying rough, arranging cutting, and selling polished diamonds. The term highlights both expertise and business standing in the trade, not just technical skill. This differs from a digger, who is someone who extracts diamonds from the earth; a cutting center, which is a place where cutting happens rather than a person; and a diamond pipeline, which refers to the flow of diamonds through the market. So the best fit for describing a knowledgeable, experienced, and successful person in that context is diamantaire.

Spotlighting focuses a bright, narrow beam of light into the diamond, making dispersion highly visible. The feature you’re looking for is fire—the rainbow-colored flashes that appear when light is split into its spectral colors by the gem’s facets. By directing a concentrated light source, you maximize these colored flashes around the edges of the stone, which is how you judge how strongly a diamond exhibits fire. Brightness, on the other hand, refers to how much light the diamond returns to the eye and is better judged under different lighting conditions that emphasize overall light return. Color relates to any natural body tint in the diamond, not to the spectral dispersion you see as fire. Clarity concerns internal inclusions and blemishes and isn’t about color dispersion either. So spotlighting is most about evaluating fire.