Lab grown fancy colour diamonds can appear different depending on lighting and background due to their crystal structure and trace elements.
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Lighting conditions:
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Natural daylight – Colours appear most accurate.
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Fluorescent light – Can enhance blue or cool tones.
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Incandescent light – Can bring out warmer hues.
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Background reflection: Dark backgrounds intensify colour, while light backgrounds soften it.
This effect is more pronounced in pink, blue, and green lab-grown diamonds due to their unique colour formation.
Natural fancy colour diamonds also show slight variations, but the effect is generally more subtle.