Gem Nation -- Glossary of Diamond, Jewelry and Watch Terms


Gem Nation -- Glossary of Diamond, Jewelry and Watch Terminology

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	Perpetual Calendar Available as a feature on some of the world's most prestigious watches, this type of calendar adjusts automatically for months of different lengths and includes February 29 in leap years. Some perpetual calendars can maintain accurate dates for as long as 400 years.

	Platinum Platinum is a whitish metal that is rarer than gold. Platinum will resist breaks, chips and cracks better than gold because of its higher density and strength. Platinum is used to create the most secure settings for diamonds.

	Polish A grade given to the external finish of a stone. Polish grades range from poor (the lowest), to fair, good, very good and excellent/ideal. Polish is crucial for maximum brilliance of a diamond. Diamonds with excellent polish and symmetry will command a higher price than diamonds with even very good symmetry and excellent polish (and vice-versa). These diamonds are extremely rare especially because of the extra diamond weight sacrificed in maintaining such pristine polish.