How can the macro shooting products of SLR cameras be clear?

Macro photos can only take a small area clear because of the small focal length, and out of focus is generally blurred.

Besides, your lens is not a macro lens. If you get close, you won't be in focus.

If you want to shoot the whole necklace clearly, you can shoot it directly on it, or hang it in a place with good light and let it face the light, which can achieve good results.