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Ruby

Chemistry

Mohs Scale Hardness

Al2O3

9

Refractive Index

1.762 to 1.770

Specific Gravity

4.00 (=/- 0.05)

Colour

Red must be a ruby’s dominant colour. Ruby hues range from orangy red to purplish-red

Distinguishing Features

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The Most Desirable Picks

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Origins

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Significant Pieces

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Formation

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Stability

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Care and Cleaning

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