Combine the sugar and 1 cup water in a saucepan over high heat. Bring to a boil and cook until the sugar dissolves. Remove from the heat and add the rosemary and orange zest; let cool to room temperature. Transfer to a lidded container and refrigerate for at least 2 and up to 24 hours. (The longer it sits, the stronger the flavor.)
Remove the rosemary and orange zest from the syrup, and discard. Fill four 8-ounce glasses with ice; add to each 2 tablespoons of the nectarine puree and 2 tablespoons of the rosemary syrup. Fill to the top with club soda or sparkling water and garnish with an orange slice. (Save any remaining syrup for another use.)
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