This folder contains a bunch of test data used to make local instances easier to work with.
If you want things to "just work", probably just
python manage.py loaddata fixtures/all.json
and you'll have a reasonably healthy database of stuff that you can use.
If you have an empty database, you can run
./fixtures/gen-dummy-data.sh
and it'll generate some dummy data dynamically to play with.
In fact, fixtures/all.json is just a snapshot of one run of this script.
That's probably just easier.
None of the data here is a puzzle or diamond.
Also, everything in this folder is a total mess. Pull requests to make this less of a pile of sludge are most welcome.