Jaggery is often described as an unrefined alternative to sugar, which understates the difference. What refining removes is doing real work in the pan, and its presence changes several outcomes.
Refining is a removal, not a transformation
Cane juice is boiled down until it solidifies. Jaggery stops there, keeping the molasses, minerals and plant residues that were in the juice.
Refined sugar continues through crystallization and washing, which strips those components out and leaves close to pure sucrose in uniform crystals.
So the two are not different sweeteners so much as the same process stopped at different points, with jaggery carrying everything that refining is designed to discard.
The molasses fraction changes how it melts
Jaggery contains moisture and invert sugars, so it softens and melts at a lower temperature and over a wider range than granulated sugar does.
That makes it easier to dissolve into a warm mixture and harder to crystallize into a clean, firm set, since the impurities interfere with crystal formation.
Sweets that depend on a crystal network for structure therefore behave unpredictably when jaggery replaces sugar, usually setting softer and staying stickier.
It browns and darkens on a different schedule
The residual proteins and minerals participate in browning reactions that pure sucrose cannot, so jaggery develops color and roasted flavor sooner.
Cooks account for this by adding it later and cooking it less, since prolonged heat pushes it from caramel toward burnt more quickly than sugar.
The flavor it brings is not neutral either: smoky, mineral and slightly sour, which suits sesame, coconut and legume-based sweets and fights delicate dairy ones.
Palm and cane versions are not interchangeable
Palm jaggery, made from date or coconut palm sap, is softer, darker and more strongly flavored than cane jaggery, and it is used regionally where the palms grow.
Cane jaggery ranges from pale gold to deep brown depending on how long it was boiled, and the pale grades taste noticeably cleaner.
Recipes that specify a grade are being precise rather than fussy, because the color indicates how much molasses character will end up in the finished sweet.
Substituting it into a recipe requires adjustment
Jaggery is less sweet by weight than refined sugar and carries moisture, so a straight swap gives a wetter, less sweet result.
American cooks often reach for dark brown sugar, which is closer than white sugar but still refined sugar with molasses added back, and it lacks the mineral edge.
Indian groceries sell jaggery in blocks and as a powder, and the powdered form dissolves more evenly, which matters where it is going into a syrup or a batter.