The phrase "stark relief" means that something is very clear, noticeable, or distinct, often in a way that highlights a sharp contrast or difference. Full definition
This sobering statistic stands in stark relief when compared with bamboo. (ecochildsplay.com)
To make matters worse, the couple's overly long engagement is thrown into even starker relief when Tom's dopey friend Alex (Chris Pratt, doing Chris Pratt) and Violet's sister Suzie (Alison Brie, doing a shaky British accent), who hooked up at Tom and Violet's engagement party, get pregnant and married in a mere matter of months. (theatlantic.com)