Layering works best when you can still notice the individual pieces. Start with one favorite item and build around its shape or tone.
Vary the spacing
For necklaces, compare the actual chain lengths and where they sit on you. Neckline, pendant size and chain thickness can change the effect. Small gaps between lengths may be less visible than you expect.
Try a common detail
A repeated curve, texture or color can connect different pieces without making them identical. Remove one piece if the combination feels crowded.
Before layering, consider whether surfaces might rub against each other. Check the care guidance for each item, especially if it includes delicate finishes or stones.