Guinevere's Enchanted Bracelet

"I think it's time to reawaken those feelings."

- Morgana to Agravaine

Guinevere's Enchanted Bracelet is a gift given to Gwen by her former love interest Lancelot. The bracelet was enchanted with a love spell by Morgana, who wanted to sabotage Gwen and Arthur's engagement to prevent her from becoming Queen.

History
When Morgana learned of Arthur's decision to marry Gwen, she tried to sabotage their relationship by raising Lancelot from the dead as a Shade. Though happy to see him alive, Gwen showed no signs of harboring any lingering feelings for Lancelot, prompting Morgana to enchant a bracelet with a love spell to awaken her old feelings for the knight.

The Shade Lancelot presented the bracelet to Gwen as a wedding gift, which she graciously accepted. Soon after she put it on, Gwen began to feel strangely drawn to Lancelot, visiting him in his tent and giving him intimate signs of affection. She was somewhat aware of her actions, as she could't remember why she kept returning to his tent, but was powerless to stop.

The night after Lancelot forfeited the wedding tourney to spare Arthur, the bracelet compelled Gwen to meet him in the great hall, where they shared a kiss. Arthur witnessed their tryst and attacked Lancelot in a rage until Gwen intervened, after which he had them both arrested. After she was placed in a cell, Gwen tore the bracelet from her wrist and threw it away. As such, there was no evidence that Gwen had been enchanted and she was banished from Camelot (Lancelot du Lac).

Trivia

 * It is unknown what became of the bracelet after Gwen threw it away, whether it remained undiscovered in her cell or was later collected by Agravaine (Lancelot du Lac).