Brooch
The Visionary Jewel from the Country of Treasure is a necklace belonging to Peach during the events of Super Mario Bros.: Peach-hime Kyushutsu Dai Sakusen!. Though it is seen rarely, it plays a rather large role in its only appearance's plot.
Peach was wearing the Visionary Jewel from the Country of Treasure from the start of Super Mario Bros.: Peach-hime Kyushutsu Dai Sakusen!, and she would appear to have dropped it during Mario's unsuccessful battle with the Koopa Troop (during which she was kidnapped by Bowser), as Mario soon afterward found it on the floor of his home. Prior to the time he found the pendant, he had been mocked by Luigi for his recounting of the wild past events and he himself was beginning to think that he may have dreamed them rather than actually experienced them, but the Visionary Jewel from the Country of Treasure served as confirmation that the past happenings had indeed happened. Its existence and ability to remind Mario of Princess Peach also seemed to mesmerize him, as he was focused on it and seemingly unable to successfully fulfill Miss Endless's grocery orders the following day. During this escapade at Mario Bros. Grocery, Luigi (who was depicted in the anime as very greedy) first noticed Mario's possession of the Visionary Jewel, soon identifying it and believing it to be very valuable. Much to both the brothers' dismay, Kibidango soon showed up, engaging in a brawl with Mario and running out of the store with the Visionary Jewel from the Country of Treasure in tow. The Mario Bros. gave chase to the dog creature, eventually retrieving the Visionary Jewel and stumbling upon the Mushroom Kingdom. By the end of the film, the Visionary Jewel from the Country of Treasure was returned to Princess Peach, and it also lifted the last of Bowser's curses over her kingdom: Shortly after Peach put the necklace on, a beam of light from it turned Kibidango (who had previously been cursed by the Koopas and turned into a dog) back into Prince Haru, prince of the Flower Kingdom and Peach's fiancé.
Interestingly, the Visionary Jewel from the Country of Treasure seems to be Super Mario Bros.: Peach-hime Kyushutsu Dai Sakusen!'s answer to a gem featured on Princess Peach's dress in almost all (if not all) the games she is featured in. As such, it can be said that the Visionary Jewel appears (albeit unnamed) in Mario games, though the Visionary Jewel from the Country of Treasure has several differences from the in-game gem it would seem to be based on. It should also be noted that the name "Visionary Jewel from the Country of Treasure" may not be the necklace's actual name, as the scene in which it is noticed and named by Luigi includes much comic relief, and its naming may have simply been part of this and not meant to be taken at face value.
