|Romanized Name||Redi Daiana|
|English Name||Lady Diana|
|Partner||Lua (now Lillian's partner)|
|Debut||A Lady's Etiquette, Ready Go !|
Lady Diana is the a character of Lady Jewelpet.
Lady Diana is a human . She has long reddish brown hair tied in a bun and purple eyes being supported with her wedding dress and huge pink heart necklace.
She is married to Momona's cousin and a past Lady Jewel Candidate she gives advice to Mommona through the changes that she faces in the competition.She just like Momona and all the other Petite ladies was also a candidate to become queen with her former partner Lua but left to marry Momona's cousin. In episode 29, it is revealed that she walked the Jewelpet dog, Nephrite during her time as a Lady Jewel Candidate
- Currently married to and in love with him.
- Seems to have a positive relationship due to her hugging Momona upon meeting her for the first time along with that she gives advice to mommona throughout her time as a Lady Jewel Candidate .