Necklace chains are made with varying thicknesses. The best thickness of the chain is entirely up to you. Everyone has their unique preference and style when it comes to necklaces. However, if you are a pendants lover, you will probably look for a thicker necklace chain. This will support the pendants without appearing to strain. Some necklaces look glamorous as thinner pieces, while others will appear beautiful as thicker pieces. It will depend on what makes your heart happy.