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The smart consumer's diamond buying guide.... |
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Diamond Buying Made Easier > Diamond Glossary > Diamond Glossary- PDiamond Glossary - Pave, Pinpoint, Poor Cut, ProportionThis is our diamond glossary of terms used in the diamond jewelry business.... facts about diamonds-  Click a letter to view terms - Diamond Glossary - PP: A grade in GIA's Color Grading System.... in the middle of the "Very Light Yellow" category.pc: Abbreviation for "per carat" pricing.... expressed as $750pc. Parcel Paper: Also called diamond papers. Folded sheets of paper used to contain polished or rough diamonds. On the outside of the paper are many different numbers- such as stock number, clarity, color, carat weight, shape, supplier, cost, etc. Contrary to what you see in the movies.... diamonds are not kept in big piles in boxes and trays... they are kept in papers. Patina: A sheen which develops on the surface of platinum jewelry through continued wear. Paste: A term for glass imitation gemstones. Pave: (pah-VAY) A style of setting small stones very tightly together, as in a pavement or paved with diamonds. Most commonly seen with diamonds, but may be used with any stone. Pavilion: The bottom portion of a diamond, below the girdle, measuring from the girdle down to the culet. Pavilion Angle: The angle measured between the girdle plane and the pavilion main facet. Pavilion Main Facet: Eight, four sided facets of a Round Brilliant Cut diamond that meet at a point to form the culet. Pear Cut: A fancy shape diamond that resembles a teardrop or pear. The Pear Shape is a combination of the Oval Shape and the Marquise Cut. Perfect: This term has been so flagrantly misused in the sale of diamonds that many jewelers avoid its use entirely. The American Gem Society also prohibits its use by its members. The Federal Trade Commission considers it an unfair trade practice to use the word "perfect", or any other word, expression or representation of similar import, as descriptive of any diamond that discloses flaws, cracks, carbon spots, clouds or other blemishes or imperfections of any kind, including inferior color and make, when examined by a trained eye under a corrected diamond eye loupe or other equal magnifier of not less than ten power. Pinpoint: A pinpoint is a extremely small included crystal inside of a diamond. A grouping of pinpoints is called a "cloud". A cloud can appear as a hazy area in the diamond. A single pinpoint can change a diamond clarity grade from an Internally Flawless to a VVS1. Pipe: The remains of an ancient volcano. Diamond bearing magma (kimberlite) had made its way to the surface via a weak spot in the earth's crust. The volcanic mountain that was formed is then eroded away from rain and all that is left is the pipe. Open pit mining is done on top of the pipe and a vertical shaft is sunk next to the pipe with horizontal tunnels dug into the pipe. Kimberlite pipes have been found in Africa, Canada, Russia, Arkansas, Australia, and elsewhere. Pit: A tiny opening on the surface of a diamond, often looking like a white dot. Platinum: A rare precious metal used in jewelry. Platinum is naturally white and is favored for many ring settings because of its durability. Plotting Diagram: A diagram used on some Diamond Grading Reports that illustrates the facets of a diamond and the approximate location and type of internal and external characteristics. Point: A trade term used to describe the weight of diamonds. One point is equivalent to one-hundredth of a carat. For example, a 1/4 carat diamond, equals 0.25ct., equals 25 points. Pointer: Term used to describe polished stones under a carat. For example, a 37 pointer (0.37ct.). Polish: The smoothness of the surface of a diamond which shows no visible wheel or burn marks. Polish is regarded as one of the indicators of the quality of as diamond's cut; it is graded as either Ideal, Excellent, Very Good, Good, Fair, or Poor. Polish Lines: Tiny parallel lines left by irregularities in the diamond cutting wheeel's surface. Polish Mark: Surface clouding caused by excessive heat (also called burn mark, or burned facet), or uneven polished surface resulting from structural irregularities. Polishing: In diamond fashioning, it is used to include both lapping, or blocking, and brillianteering, as well as the production of any facet; the final operation in fashioning a diamond, usually done with diamond powder on a horizontal disc, or lap, against which the diamond is held in a dop. Polished Girdle: A girdle that has been lapped or polished to yield a uniform, highly reflective surface. Poor Cut: A inferior cut diamond that can be either cut too deep or too shallow which will lose or leak light through the side or bottom resulting in less brilliance and value. Princess Cut: A square or rectangular-shaped modified brilliant cut diamond. Prong or Claw Setting: A setting style that uses 4 or 6 small fingers of metal that hold a diamond in place. Each metal prong is individually pushed into place to hold the diamond securely. Proportion: The proportions of a diamond are very important, so that the maximum amount of light be reflected off and out of a stone. Proportion is the relationship between the angles of the facets of the crown and pavillion. Proportion Scope: A device that combines lenses and movable mirrors to project the silhouette of a diamond onto a screen. Diagrams and scales are printed on the screen which facilitates the analyzation of the proportions of round brilliant cut diamonds, as well as fancy shaped diamonds. |
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