Copied from http://ashtender.com/gems :
PS4 and Xbox Account Linking
I’ve got some exciting news for Console players! It’s finally possible to link your PlayStation 4 or Xbox One account with your Gems of War Database account, which allows for automatic updates to your account from the game, as well as resource tracking – just like PC and Console players have had available since early this year!
To link your accounts, go to your Account page, and enter your invite code as well as other information pertaining to your account (count of two traitstone values, which can be found in your Collection tab in-game). The direct links can be found here:
A single Gems of War Database account can be linked to one each of PC/Mobile, PS4, and Xbox One game account.
To view your collection, you will need to view the platform-specific page for that collection:
Additionally, all leaderboards will work for all platforms and are separated by platform; the Ascension leaderboard can be found at http://ashtender.com/gems/ps/extras/ascension for PS4, for example. All links are per-platform in the nav bar. As per the PC/Mobile pages, you will need to opt into statistics gathering on your Account page.
The old “console” platform pages (http://ashtender.com/gems/console/troops, etc.) will continue to function for the time being, but will redirect to the PS4 page. Please update your links, especially if you are playing on Xbox.
I don’t have a PS4 or Xbox to test with, so if any information is incorrect, or I’ve broken other functionality in the process, please do not hesitate to leave me feedback at firstname.lastname@example.org, or via @Lyya on the official forums.