In the original version it requires the Accessories 5 license to equip, and can be bought for 500 gil at Dalmasca Westersand, Dyce at Ogir-Yensa Sandsea and Tomb of Raithwall, and is found at Giza Plains - The Rains (Gizas South Bank and Starfall Field) and Nam-Yensa Sandsea (Withering Shores), stolen from Mimic Queen (3% chance), and is a reward from completing the Nidhogg Hunt.
In the Zodiac versions, it now provides +2 Defense and +1 Magick Power in addition to immunity to Silence, requires the Accessories 7 license to equip, and can be bought for 800 gil at Dalmasca Westersand, Dyce in Nam-Yensa Sandsea and Tomb of Raithwall, Jahara, and Eruyt Village, found at Giza Plains - The Rains (Warrior's Wash), Salikawood (Sun-dappled Path), Tchita Uplands (Fields of Eternity), and Pharos - Second Ascent (Station of Banishment), stolen from Mimic Queen (3% chance), and is a reward for completing the Nidhogg Hunt. It is also a common steal from Mindflayer in Trial Mode Stage 17 and a Diamond Armlet treasure on Stage 20 and Stage 35.
Rose Corsage is an accessory relic that grants major resistance to the Silence condition (60% reduction in the rate an attack will Silence you). It also grants +15 Mind. It has Realm Synergy for FFXII, and the Mind stat can be boosted with the appropriate Realm Synergy or Brave Synergy. Like all status preventing relics, the resistance stacks with other sources (such as Legend Dive or an armor relic).