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Extras

    Video thumbnail: NOVA Why Diamond Light is Beautiful

    NOVA

    Why Diamond Light is Beautiful

    Much of a diamond's brilliance and fire comes down to physics.

    Why Diamond Light is Beautiful

    Video thumbnail: NOVA Treasures of the Earth: Gems Preview

    NOVA

    Treasures of the Earth: Gems Preview

    What processes in the depths of the Earth forge beautiful and precious stones?

    Treasures of the Earth: Gems Preview

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