Fill a large saucepan two-thirds full with water; bring to a boil. Cut a shallow “X” on the bottom of each peach. Using tongs, place peaches, a few at a time, in boiling water 30-60 seconds or just until skin at the “X” begins to loosen. Remove peaches and immediately drop into ice water. Pull off skins with tip of a knife; discard skins. Chop peaches., In a small bowl, sprinkle gelatin over cold water; let stand 1 minute. Meanwhile, in a large saucepan, combine peaches, sugar and lemon juice; bring to a boil. Mash peaches. Reduce heat; simmer, uncovered, 5 minutes. Add gelatin mixture; cook 1 minute longer, stirring until gelatin is completely dissolved. Cool 10 minutes., Pour into jars. Refrigerate, covered, up to 3 weeks.