Variety: Pitted green olives can come from different olive varieties, but some popular ones include Manzanilla, Hojiblanca, and Sevillano. Color: Green olives are typically picked before they fully ripen and turn black. They have a greenish hue, which can vary from light green to a darker shade. Size: Green olives come in different sizes, ranging from small to large. The size is usually indicated by numerical grading, such as medium or jumbo. The specific sizing may vary depending on the brand or supplier.