The ideal number of carats for a necklace depends on your personal style and the occasion. Diamond necklaces come in various sizes, from delicate and understated to bold and striking. Smaller carat weights, such as 0.25 to 1 carat, are popular for everyday wear, while larger carat weights, like 2 to 5 carats or more, make a statement for special occasions. The choice ultimately depends on your preferences and budget.