The diamond shape you choose for your studs is all about preference. The most common shape for earrings is round-cut diamonds, followed by princess-cut diamonds, which is a square shape. For everyday wear, you may want to choose diamonds that are 1.50 CTW or smaller. Those with sensitive ears should opt for platinum since it is a hypoallergenic metal. Otherwise, white gold, yellow gold, and rose gold are all beautiful choices for your studs.