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The smart consumer's diamond buying guide.... |
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Diamond Buying Made Easier > Diamond Glossary > Diamond Glossary- RDiamond Glossary - Radiant Cut, Rhinestone, Round Brilliant CutThis is our diamond glossary of terms used in the diamond jewelry business.... facts about diamonds-  Click a letter to view terms - Diamond Glossary - RR: A grade in GIA's Color Grading System.... at the end of the "Very Light Yellow" category.Radiant Cut: A brilliant cut fancy shape that has a square shape with the corners cut off. It might have a step cut or a scissor cut on the crown and a brilliant faceting style on the pavilion. Reflection: The bouncing back of light when it strikes an external or internal facet on a polished diamond. Refraction: The change in direction of a ray of light as it passes obliquely from a medium of one optical density to a medium of a different optical density, as from air into water or from air into a gemstone. This means that the light bends as it enters a diamond because the light travels through air and the diamond at different speeds. Rhinestone: A facetted piece of glass or quartz that has a foil backing in order to imitate a diamond. Rhodium Plating: Rhodium is metal that is part of the platinum family. White gold is commonly rhodium plated in order to give it a very white finished color because white gold is not purely white but instead has a yellowish tint It is also used on silver to prevent it from oxidizing. Rose Cut: An early style of cutting that is thought to have originated in India and to have been brought to Europe by the Venetians. In its most usual form, it has a flat, unfaceted base and a somewhat dome-shaped top that is covered with a varied number of triangular facets and terminates in a point. The rose cut diamonds are very seldom used today but may be seen in antique pieces. Rough: An unpolished diamond in its natural crystal shape. Rough Girdle: When a diamond outer shape is formed in the cutting process it is done by grinding one diamond against another. This should leave the surface of the girdle with a smooth and waxy luster. If a diamond is rounded up too quickly in the fashioning process it will leave it grainy or pitted. It may also be accompanied by numerous hair like fractures extending into the stone, which is called a bearded or fuzzy girdle. Round Brilliant Cut: This is the most common cut for a diamond. The standard round brilliant "full cut" diamond consists of a total of 58 facets: 1 table, 8 bezel facets, 8 star facets and 16 upper-girdle facets on the crown; and 8 pavilion facets, 16 lower-girdle facets, and usually a culet on the pavilion. Rounding Up or Girdling: The step in the fashioning process of a diamond in which the stone is given its overall shape. The stone is held in a lathe, or cutting machine, and another diamond, called a sharp, which is affixed to the end of a long dop that is supported by the hands and under an armpit, is brought to bear against the stone behind shaped. An older method consisted merely of rubbing two diamonds together until the desired shape was obtained. |
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