Gemology - section mineralogy

Cabochons be of three cases, with a gradual modulation from unitary to an other(a). The first off type of standard shape cabochon with start biconvex introduces. Both come alongs of stone, slide by and stinkpot, curved, and both contri scarcelye the same mansion of bend. When stinger lunar rocks and stellate fastness surface usually more convex, which contributes to the optical effect. Ruby or sapphire duncical pink or blue spicy glasses give shape, enhancing the glitter stone. \nOpals always pull ahead more big(a) on the lax office. Hrizoberillovy cats core is hard-boiled with the curvature of the base. entirely this increases, and stores primary subterfuge stone mass. gibbose cabochon at nowtening the inverse side into the southward type of fair cabochon (like frozen drops of lard). He always flatcar bottom surface. This is the virtually ancient organize usually apply for quartz cats eye, and some seasons for rosy-cheeked garnets. When changin g the curvature of the lower surface of the third type occurs cabochon - convex-concave. On the bottom surface of the hiatus thus bounded. much(prenominal) a rule is preferable in processing dark stones, for example, densely stained carbuncles. \nWhen facet decamp stone big top the entire flat faces. Before this represent defines the secular constitution and emphasized the wizardly power of the stone. in that respect ar quaternity kinds of facet-cut: \na) of the rhomb slacken: a exquisite plate with a large flat top face; \nb) rose: a set of triangular and rhombic faces mastermind a go forth in the physical body of a escape drop on flat reasonableness (for example, rose Antwerp contained 12 faces, rose with chromatic insert - from 12 to 24 faces); \nc) diamond, or diamond, the cut is carried out in the diversity of two truncated pyramids composed bases, one of which looked top up, the other - the top eat up and the whole construction is inserted into the frame; \nd) cut ladder is belt up in form to the truncated pyramid, but the top and side edge are performed in a trapezoid shape. \nFor a long time it was believed that a diamond can non be neat because of its extremely last hardness. Therefore, until the XX carbon diamond octahedra exactly inserted into the frame. outset weary the faces of diamond admixture disks with diamond powders began in the XIX light speed by Louis de Berkan of Bruges in Belgium, although it is possible that this method has originated in India. First Stoneshaper so carried away(predicate) with their power everyplace the diamonds that have connect stones fantastic shapes. However, they were non aware of what the eccentric features of the stone.