Add apricots to a Dutch oven fitted with a candy thermometer, with the lemon, sugar and apple juice. Cook on medium-low, stirring until sugar has dissolved.
Increase the heat to medium-high and bring the jam to a full boil, stirring constantly. A full boil is a boil that cannot be stirred down. You may need to adjust your heat level once it reaches to a full boil to prevent scorching, I usually have to turn down the heat slightly.
Carefully stir constantly at a full boil for 17 to 18 minutes, or until the jam reaches 220°F. If you are using the wrinkle test to check the setting cook, test at 17 minutes. If the jam mounds and wrinkles when dropped on a chilled plate and nudged with your fingernail, it’s done. If not, continue to cook, then re-test the jam until it reaches that consistency.
Once you are satisfied with the results of the wrinkle test or your jam reaches 220°F, Skim off any foam remaining on the surface of the jam, and remove from the heat.
Carefully, ladle the jam into three 1/2-pint jars, leaving 1/4 inch of space at the top. Close the jars and let the jam cool to room temperature.
Store the jam in the refrigerator for up to 3 months.