In a small pot, simmer cream, milk, sugar and salt until sugar is dissolved, about 5 minutes. Remove pot from heat.
In a separate bowl, whisk yolks and vanilla extract. Whisking constantly, slowly whisk 1/3 of the hot cream into the yolks, then, whisk the yolk mixture back into the pot with the cream. Return pot to medium-low heat. Cook until mixture is thick enough to coat the back of a spoon or spatula.
Cool mixture at room temperature. Cover with plastic wrap and chill for at least 4 hours or overnight.
Churn cooled base in ice cream machine according to manufacturer's directions.
Scoop half of the churned ice cream into a large mixing bowl. Sprinkle with half of the blueberries and use a small spoon to scatter nubs of lemon curd. Spoon over blueberry jam and use a wooden spoon or spatula to swirl into the ice cream base. Top with remaining ice cream, lemon curd and blueberry jam. Swirl the mixture a second time and finish by sprinkling with the remaining blueberries.
Serve Lemon Blueberry Ice Cream directly from the bowl as soft serve, or store in the freezer until ready to eat.