The color of an object (such as your rice bowl) is just one of its many attributes, and other attributes include material and shape. According to the analysis of five elements, the influence of materials should be greater.
If you analyze the five elements, you must look at the five elements in personal numerology and choose the attributes that hit the five elements.
But in real life, most bowls are round. I believe that few people don't like gold because of their lives, but don't use round bowls.