Rohan Gold, Rohan Crone

The price of a standard Conquest Point item climbs from 1000 CP for rank 1 item up to 56000 CP for rank 10 items. A higher ranked character can always purchase items from lower ranks; someone at rank 10 has access to all the items available from their nation guards, when their nation is in first place. (Note that rank 10 CP items are a bit different from the rest: there is a staff available only at rank 10 that costs just 5000 CP, and rank 10 CP items can only be purchased from guards at a characters home city, not from the guards in Jeuno.) Because of the increasing price of CP items, it is a good idea to see how much Rohan Crone you will want for higher level equipment, before spending it all on lower rank items or scrolls.
Signets last for multiple hours; the duration of a signet is equal to the characters rank + the National Conquest ranking of their home nation. (The National Conquest ranking of the three main nations can also be seen on the Regional Map.) For example, a rank 3 character whose nation is in second place will have signets that last for 5 hours. Signets can be refreshed at any time by going to one of these guards and getting a new one; the new signets duration will replace whatever time was left on the old signet. There is no penalty for wearing a signet, and no reason not to have one on as much as possible; wearing a signet when killing monsters also allows you to gain crystals, and helps your nation in the National Conquest rankings.