cuts. The basic rose cut has a flat base—that is, it lacks a pavilion—and has a crown composed of triangular facets (usually 12 or 24) rising to form a point (there is no table facet) in an arrangement with sixfold rotational symmetry. The so-called double rose cut is a variation that adds six kite facets at the margin of the base. The classic rose cut is circular in outline; non-circular variations on the rose cut include the briolette (oval), Antwerp rose (hexagonal), and double Dutch rose (resembling two rose cuts united back-to-back). Rose-cut diamonds are seldom seen nowadays, except in antique jewelry. Like the older style brilliants and step cuts, there is a growing demand for the purpose of repairing or reproducing antique pieces. Related to the rose cut, and of similar antiquity, is the mogul cut, named after the Great Mogul diamond that was the most famous example of its type. Like the classic rose cut, the mogul cut also lacks a pavilion and a table facet, and its crown is also composed of triangular facets rising to form a point. But in mogul-cut diamonds the rotational symmetry is normally fourfold or eightfold, and the eight apical facets are girded by two or more additional rings of facets. The modern mogul cut evolved from earlier faceting techniques originally used to disguise internal flaws in large stones; in the modern day this cut has also become rare, but still finds occasional use where it is less important to showcase a stone's internal clarity, as with the black and internally opaque Spirit of de Grisogono Diamond. Cut grading The "Cut" of the "4 Cs" is the most difficult part for a consumer to judge when selecting a good diamond. This is because some certificates do not show the important measurements influencing cut (such as the pavilion angle and crown angle) and do not provide a subjective ranking of how good the cut was. The other three Cs can be ranked simply by the rating in each category. It requires a trained eye to judge the quality of a diamond cut, and the task is complicated by the fact that different standards are used in different countries (see proportions of the round brilliant). The relationship between the crown angle and the pavilion angle has the greatest effect on the look of the diamond. A slightly steep pavilion angle can be complemented by