Comparing the two fragrances…

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Roger & Gallet
Rose Diamant
Rose
Shared character
Both Rose Diamant and Rose belong to the floral fragrance family and share notes of rose and almond milk.
How they differ
Rose Diamant features notes of bergamot and peach. Rose contains a wider range of notes including aldehyde, musk, amber, mandarin orange, peony, rose damascena, almond, white blossoms, rosebud, nepalese rose, and white flowers. The accords for Rose Diamant are strictly floral, whereas Rose includes citrus, woody, green, fruity, fresh, sweet, almond, nutty, rose, and white floral accords.
Who each suits
Rose Diamant is suited for those who prefer a floral scent with bergamot and peach. Rose is suited for those who prefer a complex profile involving aldehydes, musk, amber, various citrus elements, and diverse floral notes.