Use proportion as a guide, not a rule.
Face shape can help you understand proportion, but it should never override what feels like you. The hairstyle, neckline and earring scale usually matter just as much.
Round face
Elongated or vertically directed earrings can create a stronger downward line. If you prefer fuller jhumkas, compare how much width they add near the cheeks.
Oval face
Most proportions can work, so focus less on correcting shape and more on how the earring scale relates to your hairstyle and outfit.
Heart-shaped face
Silhouettes that carry more visual weight lower down can create balance around a narrower chin. Teardrop and jhumka-inspired shapes are worth testing.
Square or angular face
Curved, rounded and softly moving silhouettes can create contrast with stronger facial angles. The goal is not to hide structure, only to decide how much contrast you want.
Long or oblong face
Fuller and wider shapes can add horizontal presence. Very long earrings may exaggerate vertical length, which can be useful or unnecessary depending on the look you want.
Now add the hairstyle
Sleek bun: the entire earring is visible, so scale and shape become more prominent.
Open waves: part of the jewellery may disappear into the hair. Test the pair while moving, not only with the hair placed perfectly.
Side-part or side-swept hair: the two sides of the face may carry different visual weight. Look at the complete front view before deciding.
Covered or draped styling: check how the fabric frames the ear and whether it competes with the jewellery.
The useful test
Put the earrings on with your intended hairstyle, take three photographs and move your head naturally. Choose the pair that still feels balanced when nothing is being manually arranged for the mirror.