Why does the narrator compare dialogue in writing to diamond

Narration is the action of a character telling a story. Narration allows the author to freely move the story forward or backwards. ... However, when an author uses dialogue, the timeline of the story slows down. We are in real-time with characters and should be focusing closely to each sentence each character says.

Explanation:

no its not a run on sentence however i think you meant wet suits not sours also a run on sentence would be like surfers surf all winter long in southern california by using wet sours to keep them warm and the live their all year long  

answer: we need to see the ads : )