In a medium saucepan, combine the peach preserves, honey, brown sugar, and lemon. Bring to a boil; reduce heat and simmer for 2 minutes
Rub the pork loin all over with salt and freshly ground black pepper. Place the roast, in a baking pan, fat side up. Roast for 1 hour.
Coat the roast with the peach mixture. Continue roasting for about 30 minutes, brushing with glaze as needed. Thermometer should read 145 degrees at center of roast when done.
Let rest for 10 minutes before slicing and serving with the pan juices.