Queen's Necklace originates from the infamous affair of the Diamond Necklace, which tarnished Queen Marie Antoinette's reputation, leading to the French Revolution and the queen's subsequent execution.
"The diamond necklace that Jeanne de la Motte swindled from jewelers in 1785 by claiming it was on behalf of the Queen of France, Marie Antoinette."
—Persona 5 background
Queen's Necklace is the first Persona of the Empress Arcana and can be found in Kaneshiro's Palace and in the Kaitul area of Mementos. It is weak to Gun and will join immediately once knocked down and asked to join. Queen's Necklace has all of the single target buffs and debuffs, the Media skill and is the first Persona to have the Recarm skill. However, as it is not able to be used in battle, the skills must be passed on through fusion in the Velvet Room to be used.
Queen's Necklace will itemize into the Queen's Necklace accessory, which grants +1 to all stats and +30 SP.
Fusing Treasure Demons allows a Persona to "rank up" or down within its own Arcana, making it easy for the protagonist to obtain any missing personas in their compendium, however, this will not always allow for optimal skills for each Persona to be learned this way.
Fusing Queen's Necklace has the following effects on the various Arcana: