1. "Seashells can be made into various things" may be what you want to say. "transformed" is not necessarily wrong, but it sounds grander and more dramatic.
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GPY"in our hands" seems superfluous, at least without further context.However, it just occurred to me that this may be what you are aiming for:
Thein Lwin 72911. Don't consider them(seashells) rubbish.2. If we only use our intellect, we can get gold from them.(1) is OK. (I assume that the part in brackets doesn't appear in the actual sentence, but note that a space is required before an opening bracket.)