Why can graphite not be used in jewellery in place of diamonds?

Graphite cannot be used in jewellery because graphite is soft and dull, while diamond is hard and shiny. Although both diamond and graphite are made of carbon atoms, the difference lies in their structure. Diamond has a 3D structure where every carbon atom is strongly bonded, making it the hardest natural substance. Graphite has a layered structure with weak bonds, which makes it soft, breakable, and not suitable for ornaments.

Diamond vs Graphite