Jewel



Rare and precious, Jewels, sometimes called Gems in the Catacomb Adventure Series, are useful items that upgrade the Crystal Sphere. Each one covers the denizens of different areas, and will give you their position on the Sphere if they get in range. Without the Jewel, those associated enemies will not show up on the Crystal Sphere at all, so finding them can be extremely helpful.

In almost every game in the series, there are multiple gems of every color hidden away, so if a player misses one in an earlier level, there is a chance to get it again later.

In Catacomb Abyss
In Catacomb Abyss, the Jewels are pretty evenly scattered through the early levels, resulting in the player being able to collect the entire set by Level 8.

Purple Jewel
Detects: Zombies
 * Found in a storeroom in The Towne Cemetery, behind a door requiring a Red Key.

Yellow Jewel
Detects: Skeleton Warriors
 * Found in a storeroom in The Mausoleum Grounds, behind a door requiring a Yellow Key.

Red Jewel
Detects: Mages, Evil Eyes, Red Demons.
 * Found in a storeroom in The Main Floor of the Mausoleum, in the Place of Enchanted Cubes. Destroy a cube to find it.

Blue Jewel
Detects: Water Trolls, Blue Demons.
 * Found in The Ancient Aqueduct.

Green Jewel
Detects: Green Trolls, Orcs.
 * Found in The Orc Mines.

In Catacomb Armageddon
In Catacomb Armageddon, the Jewels are found very early on, so the player has all of them by Level 6.

If the player misses any, every single one appears in The Chamber of the Evil Eye.

Purple Jewel
Detects: Zombies.
 * Found in the Hidden Storeroom in The Towne of Morbidity, next to a Blue Key.

Yellow Jewel
Detects: Treants, Skeleton Warriors, Killer Rabbits.
 * Found in The Dark Forest, right before the end of the level.

Red Jewel
Detects: Giant Ants, Mages, Evil Eyes, Two-Headed Demons.
 * Found in The Garden of Forgotten Souls, behind a breakable wall directly in front of the starting point.

Green Jewel
Detects: Vipers, Wretched Poxes.
 * Found in The Lost City of the Damned, in the Hall of Bones, behind a breakable wall.

Blue Jewel
Detects: Succubi, Sea Serpents.
 * Found in The Demon Hold, at the level exit.

In Catacomb Apocalypse
Unusually, in Catacomb Apocalypse, the Green and Yellow Jewels are hidden in the first two levels, and then all of them can be found in the 4th level.

Green Jewel
Detects: Wizards, Fishmen.
 * Found in The Sanctuary of the Dead, behind a hidden wall in the Wizard's Garden.

Yellow Jewel
Detects: Death Squads, Spectres, Robot Ants.
 * Found in The Wizard's Garden, inside the hidden temple after a huge number of Robot Ants.

Red Jewel
Detects: Cyborg Demons, Time Lords, Walking Tanks.
 * Found in The Axis of the Time Lords, in the Keep of the Mystic Gems.

Purple Jewel
Detects: ????????
 * Found in The Axis of the Time Lords, in the Keep of the Mystic Gems.

Blue Jewel
Detects: ????????
 * Found in The Axis of the Time Lords, in the Keep of the Mystic Gems.