Citrus is perfume at its most immediate: bergamot, lemon, grapefruit and mandarin, zested and sprayed. It is the universal opener, nearly every fragrance starts citrus, but scents that keep citrus at the center stay bright, awake and clean-cut from first spray to drydown. The cost is longevity; citrus oils are the lightest in the palette, so these scents fade politely rather than lingering. That makes them perfect for hot climates, mornings, offices and anyone who hates the idea of "wearing perfume" but wants to smell crisp. Acqua di Giò and Light Blue are the two reference points the whole category orbits, and Coco Mademoiselle shows citrus growing up into something plush. Spray liberally; subtlety is built in.