Offer all the Crown Jewels received in the battle in the arena tied to your account statistics. It is more correct. They will move from city to city with the owner. And if you bought all the improvements for the Crown Jewels, you can make a purchase of glory in the city for them. For example for 100 the Crown Jewels to give 5 glory. It will make fighting more in demand and valuable. Fighting in the arena not lose your time and efforts in the arena! And, you can make statistics of fame for sellers, the arena combatants by the number of extracted Crown Jewels.
P.S. Sorry for my English.