@HinTan
I am sure it would be possible to learn how to use S3D to create 3D Designs for Jewellery.
Clearly a miniature version of the ‘fish’ like model fully completed and properly finished would possibly make a ‘Charm’ for a Bracelet.
Another Jewellery item was discussed during:
https://discourse.shapr3d.com/t/a-ring-made-of-a-triple-helix/6002/2
More information, scroll down in the following, on the above subject at:
https://discourse.shapr3d.com/t/modeling-a-3d-spiral-spring/6317
If you would prefer to start with something simpler, a Five Pointed Star, this may help:
https://discourse.shapr3d.com/t/help-with-a-star-form/8808
If you feel you need help getting through any of the above suggestions, just shout.
If you would like to start something of your own please give as much information as possible, images are most helpful along with Dimensions. I will do my best to give you a good start.
Looking forward to your response, and also very interested in seeing your S3D Design.