Items that are found in dust clouds in caves

Usually

Bug Gem
Dark Gem
Dragon Gem
Electric Gem
Everstone
Fighting Gem
Fire Gem
Flying Gem
Ghost Gem
Grass Gem
Ground Gem
Ice Gem
Normal Gem
Psychic Gem
Rock Gem
Steel Gem
Water Gem

Almost Never found

Dawn Stone
Dusk Stone
Fire Stone
Leaf Stone
Moon Stone
Oval Stone
Shiny Stone
Sun Stone
Thunderstone

Water Stone