Some update with this resource.
I have nearly finished the gems, at least I have finished the icons.
Aligning the icons so that they do not look too weird side by side and are properly centered was hell !
I have made a custom grid that I will share soon in order to help with proper icon alignment in a 1024x1024 graphic atlas, especially if you want the icon to not overlay the gui inventory frame.
I only need to make 7 different specular maps, one by gem cut model, those maps will be shared among all gems.
I have now 7 gems cut model with 18 different color variations for a total of 126 different gems.
I don't know if it is really useful to have this much but I have made them anyway.
I will use 7 of the gem materials for sets of gem decorated keys and locks.
Since the models will share the same gems material and uvw mapping, there will be 119 more variations available for the key/lock sets for anyone willing to make them.
For those wondering the gem type and name here they are :
Almandine, Amethyst, Aquamarine, Beryl, Citrine, Diamond, Emerald, Peridot, Rhodolite, Ruby, Sapphire, Topaz, Tourmaline. Some have color variations others only have a single one. Precious gems like Ruby and Emerald have a single color, semi precious gems like Beryl and Aquamarine have at least two of them.
Here are some updated shots :
In order,
yellow and orange variations then
red, violet and magenta variations followed by
green variations and finally
white, black and blue variations.
Same groups of gems but in the dark with no light source to show the glow effect.

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A group of gems two tiles away. The glow effect is visible up to 8 tile away.

I am also working on the locks and I was not totally happy with the metal textures so far, so I am in the process to remake them. I will also update the keys with the new metal textures I am making. Here is an example with the
Star shaped lock which is finished :
I have also worked a bit on wooden doors.
I have tried to make a door model with detailed iron works on it but it does not work well in the editor while making the model heavier poly wise. The added details in the model ends up being totally useless and not improving the look of the door that much, so I have decided to bake all the details in the texture.
Here are some shots of the WIP wooden doors, the wood especially needs some more work and details.
The finished doors will have more detailed wood panels and a specific model with a thick metal frame.
Thanks to
Phitt I have managed to make working single doors opening down, left and right. I could have only made a door opening left and let it be rotated in the editor to change to opening direction but it was simple to make two different one so I went ahead. I did not manage to make double doors opening in different direction yet but I have plans to make some tests with this.
The doors in action :
More to come...