Gems can be a useful thing. There are three types of Gems, Goddess
Gems, Kappa Gems, and Gem of Truth. The gem of truth are found in various
locations below, but the goddess and Kappa ones are in certain floors of the
mine. I have never got all of them but through research online this is
what I came up with. If anything is wrong or I missed one let me know.
The only gem of truth I was able to get without having the cabinets is the horse
race one so I assume there is a requirement of having the cabinet for most.
Name of Gem: Gem of the Goddess
What it Does: Regains your Strength if equipped
Where is it found?:
Spring Mine, floor 60
Spring Mine, floor 102
Spring Mine, floor 123
Spring Mine, floor 152
Spring Mine, floor 155
Spring Mine, floor 171
Spring Mine, floor 190
Spring Mine, floor 202
Spring Mine, floor 222
Name of Gem: Gem of the Kappa
What it does: Regains your Fatigue if equipped
Locations:
Lake Mine, floor 0
Lake Mine, floor 40
Lake Mine, floor 60
Lake Mine, floor 80
Lake Mine, floor 120
Lake Mine, floor 140
Lake Mine, floor 160
Lake Mine, floor 180
Lake Mine, floor 255
Name of Gem: Gem of Truth
What it Does: Displays your Fatigue and Strength its a bar looking thing
Locations:
On your dog house roof
Check the water trough in your Horse's Barn
Exchange for 1000 medals at the Horse Race (only really plausible if you bet on
a long shot)
Buy from Won for 50000 G (he'll show up at your hose in the morning)
Check one of the lampposts between the Church and Rose Plaza
In Mary's Library, 2nd floor, middle set of shelves, furthest one to the right
Play the New Years game show on the TV inside of the Town Cottage (only
available first couple days of spring)
Drops from the calendar in the Mountain Cottage (see house section)
Take all 8 to Thomas' house and check the refrigerator
The gems will be in the tool menu and I believe you have to equip them to use
them, however, I have never got a full gem so I cant say for sure.