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- Saturation
- A color's position on a neutral to vivid scale.
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- Scratch
- A linear indentation normally seen as a fine white line.
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- Scratch Graining
- Surface indication of structural irregularity. May resemble faint facet junction lines, or cause a grooved or wavy surface, often cross facet junctions.
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- SI1
- Slightly Included
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- SI2
- Slightly Included
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- Spread Stone
- A diamond with a large table and a thin crown height.
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