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The four Cs
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Colour – the D-to-Z scale
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Clarity – inclusions and blemishes
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Cut – why it matters most
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Course map
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Shapes and proportions
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Round, emerald, pear and other shapes
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Proportions, symmetry and polish
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In practice
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Reading a stone under the loupe
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Explaining the 4 Cs to a customer
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Final quiz
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