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Deep crystal is a type of high-transparency sapphire glass. Typically, replica watches cut costs by not using the highest-grade sapphire as the base material, which often results in a milky reflection. Light passing through such crystals cannot accurately restore the original colors. Many claim that VSF’s crystal is good enough, but tests show that deep crystal still outperforms it. As seen in the images, VSF’s crystal alters the original green hue of the box, and at the same angle, its milky reflection is more pronounced.