Is it necessary to use a macro lens for trinkets photography?

The real meaning of macro lens is "enlarger lens". As the name implies, it is like a magnifying glass, which can enlarge the scene and is mainly used to shoot the details of small items.

so whether you need to use it depends on what your photos want to show, or how much detail you want to show.

the lens has a parameter called "maximum magnification ratio", which means the ratio of the maximum imaging size on the photosensitive element to the actual size of the object. Generally speaking, a lens with a magnification ratio of 1:2 will be called a macro lens. Most famous macro lenses are 1:1. For non-macro lenses, the magnification ratio is generally 1:4~1:6.

what is this concept? For example, you shoot a ring with a lens with a magnification ratio of 1:1. The actual diameter of the diamond ring surface is 5mm, so the photosensitive element can also be photographed as large as 5 mm. The size of the photosensitive element of the full-size camera is 36*24mm, so 5mm occupies about 1/7 of the length of the photo. If you enlarge this photo to the size of A4 paper (297*21mm), you can see the diamond ring face with a diameter of about 42 mm..

If a lens with a magnification ratio of 1:4 is used, the maximum diameter of the ring surface on A4 paper can only be about 1mm.