Please don't list this on a work's page as a trope. Examples can go on the work's YMMV tab.
Tear Jerker: Jewelpet
Rinko's initial breakdown in episode 50. Seeing Dian petrifying Nanase after she obtained the Jewel Stick not only scarred her, but she actually blamed Dian for everything he did.
Episode 28. Miria almost abandons her dream of being a singer, causing Garnet and Sango to become sick with fever and collapse. After some flashbacks of the times Miria spent with them while her mother was away, Miria realizes her grave mistake and decides to chase her dream again. And sings a beautiful song to help Garnet and Sango get better.
Episode 37. Alma breaks in tears when she learns the truth from Akari. Despite all of that, she still rejected it and unlocked the Battest just for the sake of reviving her mother. She got a serious breakdown plus triggered The End of the World as We Know It.
Episode 50, Alma breaking down when Diana (the only one in the whole world that she considered her friend, after seeing other people she trusted drift away from her) sacrifices herself to save her from the Battest.
Episode 25. Garnet and Dian are enjoying their relationship, when Diana shows up demanding that Garnet "give him back to her". Diana's patheticness during the scene is tear-jerking in itself, but the real kicker is Dian apologizing to Garnet and leaving her in the rain (WTH, man? At least give her an umbrella.) because he still loves Diana. Garnet is all alone in the rain, battered and her dress in tatters from fighting Diana, and cries buckets. Poor, poor Garnet.
Ruby's temporary death in episode 51. It made Kanon, her rival, cry so hard and Mikage realize his feelings for her that he had locked away.
The ending - it was a downer at first, and then became a serious but romantic moment between a former human turned into a Jewelpet and Ruby. Ruby met a Jewelpet named Granite, who she discovered was Mikage. She broke down and ran to him in tears, calling him a jerk for not appearing in the last 5 years until she forgives him. And so they become a couple.
Ruby forgiving Pink at the end of episode 22 after all of the trouble she caused, all thanks to King. All she has to do is say sorry.
The last episode, in which the Kira Deco 5 had to say their goodbyes to their Jewelpet partners.
Sweets Dance Princess
During the scene where the princess tells everyone they should destroy Gumimin to save Sweetsland, Ruby totally objects to the idea seeing as they were friends and she doesn't want him to be killed. And gave her another resolve to actually save him.
Rossa and Labra's alone time scene in episode 2 regarding the missing Magic Gem. They even make up and cry on each other's shoulders. May count as a big Ho Yay moment.
Angela's Dull Eyes of Unhappiness saddened her. Only to find out that she's seriously heartbroken on how Labra and Rossa preferred to ride the dragon instead of her. To the verge she starts to cry.