Stone (Luigi's Mansion)
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Ten of each color can be found in the Mansion, totaling 23,000,000G. To find them all, Luigi has to water all the plants he can find, examine a variety of objects such as buckets, gutters and gold chandeliers, catch Speedy Spirits, and light up all the rooms in the mansion except for the third and Basement floor hallways.
* - Replaced by a Silver Diamond in the PAL Hidden Mansion.