Pour raspberry rose water syrup into the bottle of a glass.
Fill glass with large chunks of crushed clear ice.
Separately, combine pink gin and grapefruit juice in a mixing glass with ice.
Stir to chill, then add pre-chilled raspberry seltzer.
Gently pour into your glass so that it layers on top of the syrup.
Top off with sparkling rosé.
Garnish with grapefruit slice, fresh raspberries and some blossoms.