There are counterfeit gold pieces being spent around Ni-Yana's high end. Kal brought it to my attention last night, but he couldn't pinpoint who might have been spending them. It's quite possibly someone middle-class, dressing up and trying to look like they're from the top end of town. Keep an eye out for anyone who doesn't quite fit in. The Talons are investigating everyone with access to the royal mint right now, but it doesn't hurt to have others on the lookout, too.
The coins themselves look almost identical to the real ones, but they're only about three-quarters to two-thirds the thickness. It's not something you'd notice unless you actually looked at them. If you've got any suspicious coins, bring them to the palace and I'll see what I can do. Highly unlikely since you never get gold coins as change, but it's something to look out for.