Bring sugar and water in a small saucepan to a boil over high heat. Remove from heat and let cool.
Stir sugar syrup and rose water into lime juice in a 4 cups glass measure. Pour in sparkling water to make 4 cups. Serve immediately over ice.
Bring sugar and water in a small saucepan to a boil over high heat. Remove from heat and let cool.
Stir sugar syrup and rose water into lime juice in a 950 ml glass measure. Pour in sparkling water to make 950 ml. Serve immediately over ice.