Cut in a cone shape with many facets that results in maximal light return through the top. Rarely less than 50% of the diamond is removed. The Source of the Diamond's Brilliance Modern diamonds has 58 facets (faces) and are shaped like two pyramids sitting base to base with a thin "girdle" separating them. The top pyramid (crown) has a large inner table surrounded by three circles of facets, an inner circle of 8 (star) facets, a middle circle of 16 (kite) facets and an outer circle of 16 (upper girdle) facets. The lower pyramid (pavilion) consists of one cutlet (a small central circle located at the apex) surrounded by a circle of 8 (pavilion) facets that are surrounded by a circle of 16 (lower girdle) facets. In recent years diamond cutters have begun adding as many as 96 facets or more to the surrounding girdle, but these are not counted as official facets. The brilliance of the diamond depends on the polish and alignment of the facets, the crown angle, pavilion angle, table size, and length of the lower facets. Absorbed light can reflect off any facet, so the path light follows within the diamond is complex. The understanding of how best to arrange the facets so as to maximize light return has grown more and more complex. Several groups have developed grading standards that best describe the gem cutters success at maximizing light return when the distance to the viewer's eye is anywhere from 10 – 16 inches. All experts agree that optimal face placement is the key to brilliance.
Kruckemeyer & Cohn Jewelry Store has been Evansville, Indiana’s leading jewelers since 1895. Our GIA certified sales associates are both friendly and knowledgeable. This means that your experience at Kruckemeyer & Cohn is one that you will never forget. .
Tuesday, July 26, 2016
Diamond Brilliance
Friday, July 22, 2016
What Makes a Quality Diamond
What Makes a Diamond Valuable ? When describing the quality of a diamond, professionals use the Gemological Institute of America (GIA) grading system. The GIA establishes the diamond's character based on four factors. Rarity of a diamond's characteristic often influences how graders rate it. Color: Colorless diamonds are hard to find; most diamonds have yellow or brown tints. So the closer a diamond gets to colorless, the more it is worth. The DIA color scale ranges from D (colorless) to Z. Because colorless diamonds are so uncommon, there is a rapid rise in price as a diamond approaches colorless. Clarity: A diamond's clarity is based on the relative absence of inclusions or blemishes (clarity characteristics). Blemishes are external scratches or nicks, whereas inclusions are flaws on the inside of the diamond, although they may break the surface. Diamonds are graded by a skilled examiner who looks at it under 10X magnification. A flawless diamond has no internal or external imperfections when examined under magnification. These diamonds are so rare that a diamond professional may never see even one in his whole career. Cut: Cut refers to the way a diamond cutter created facets on the diamonds surface. A superior cut will affect the amount of light returned to the viewer's eye (the face-up appearance). A well polished diamond will be bright (lots of white light reflected back to the observer), colorful (containing flashes of color called fire), and scintillating (exhibiting attractive contrast of light and dark areas). Size: Diamonds are carefully weighed in carats. One metric carat is two-tenths (0.2) of a gram. As the diamond's size increases so does its value relative to other diamonds of similar color, clarity, and cut. But because larger diamonds are much rarer, a larger diamond costs more per carat than a smaller one.