Okay, due to popular demand, I'll include one of the rings for her on the order.
Jeyne: "It does what?"
Viserys: "Roughly make you twice as powerful for half as much effort, at least until it runs out for the day. There is a limit on the ring... the equivalent of a sorcerer of the second circle, I suppose? But anything up to that is fair game."
Jeyne, blinking, suddenly worried about even scratching the thing: "And... you said it was worth how much?"
Viserys: "Roughly eight thousand marks."
Jeyne, faintly:
"Eight thousand?"
Viserys: "Yes, before the mark up.
Jeyne, looking pretty pale:
"Mark up?"
Viserys: "Yes, something like two thirds as much more than usual market price? There wasn't much point in getting the more advanced version for you just yet. Don't worry, we can make it twice as strong later on, it was only another twenty thousand or so to upgrade it, give or take... probably give, to be honest."
Viserys: "Lady Jeyne? Are you alright? What's wrong?!"
...
Jeyne: "And... you said it was worth how much?"
Viserys, after thinking about her question a bit more: "Don't worry about it."
Jeyne: "But you said..."
Viserys: "Really, don't worry about it."