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Saturation - the strength or purity of a color's hue.
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Scarab - a gemstone cut in the form of a beetle.
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Scintillation - the sparkling reflection of light from a gemstone when the item, the view or the source of light moves.
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Setting - a mounting or portion of a mounting that actually hold a gemstone.
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Shank - the band of a finger ring.
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Signet Ring - a ring that does not contain any gemstones and has a flat surface. Ofter the flat surface of these rings are engraved with a monogram.
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Shoulder - the top portion of the shank that adjoins it to the top part or bridge of a ring.
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Solitaire - a ring that has one center gemstone as its main design feature.
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Sterling Silver - is 915 parts silver and 85 parts other metals (alloy) including solder. The quality mark is stamped as .915.
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Synthetic - a man-made gemstone that has the same physical, chemical and optical properties of a natural gemstone.