Thaw blueberries if frozen. Crush with bottom of a large glass or potato masher. (Do not use a food processor.) Stir berries with pineapple and sugar in a bowl. Let stand 10 minutes.
Finely grate peel from lemon and squeeze out 1/4 cup juice. Stir into fruit with Certo. Stir constantly until most of sugar is dissolved, about 3 minutes. Pour into clean jars or containers.
Cover tightly and let stand at room temperature until set, about 8 to 24 hours. Once set, refrigerate for up to 3 weeks or freeze.
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