The most basic classic essentials of your must have pearl earrings. 

Shape: Button, Colour: White, Grade AAA (The best freshwater pearl grade)
Size: XS (5mm dia), S (7mm dia), M (8mm dia), L (10mm dia)
Type: Pearl stud earrings;oneforone
Back of the earrings: Classic Screw Back Silver 925 
Lightweight 0.5-2 g per pair