In a large measuring cup, or shaker, combine grapefruit juice, lime simple syrup, lime juice, and rosé. Fill glasses with crushed ice and fruit wedges. Divide drink between two glasses and top with sparkling grapefruit beverage.
Homemade Lime Simple Syrup
Combine sugar, water, and lime zest in a small saucepan. Heat until just boiling, and sugar has dissolved, stirring frequently.
Remove from heat, place in a sterilized glass jar. Let it come to room temperature, then place in refrigerator until completely chilled.