Lady Diana

Lady Diana is a human of origin. She has long brown hair tied in a bun and supported with her wedding dress and huge pink heart necklace. This outfit was seen in her first appearance, but as a Queen Candidate, wore a long sleeved white shirt with a yellow hooded vest, orange skirt, knee-high socks and black shoes.

She is married to Momona's cousin. It also seems that Lady Diana was also once a Queen Candidate, because Momona inherited her letterpen. She is known to be Luea's old partner.

(Source: Jewelpet Wikia)