Glossary of the Gemtrade

For the visual size of a stone of a stone you have also to look at the dimensions and shape. A round and deep two carat stone might replica watches actually look smaller than a princess cut one carat stone. Important for jewelry is the ;face; of a stone. Ideally you want a stone having a big face but no ;window;.Certificate: Gemological report (not ;grading report; or ;appraisal;) about a gemstone. Must be issued by an independent 3rd party company. They start with *** variety identification for $25 and go up to comprehensive scientific studies for several thousand dollars. Chip: Su***ce flaw, usually caused by sudden temperature changes during transport or pressure during setting. Heated stones are more likely to chip.Clean: A gemstone without or with very few inclusions.Appraisal: 3rd party financial judgment about a stone or jewelry. To be distinguished from a ;certificate; and a ;grading report;.Bead: Smooth round polished gem. Belly: Wide shape in the lower part of the gem. Generally pushing up the total weight. Must not be ugly but is expensive when compared to a ideal cut stone without belly but an equally sized ;face;.Bi- or Multi-color: Gem exhibiting more than one color in the same light and position. Nearly every gem shows different colors in different lights and angles. This is not called multicolored. Black-out: Parts of a gemstone which do not throw back light and thus seem dark. This is also called ;extinction;. Bleeding: This is a term for an unpleasant loss of color and saturation in different light settings. Cabochon: Smooth polished gem, usually single sided when to exhibit stars or cats eyes. Also used on rough gems which are too included to have luster (when faceted) but have a good enough color to be attractive. Carat: Weight dimension for gemstones. Equals 0.2 gram.