Stone (Luigi's Mansion)

Stones, also known as Jewels, are valuable collectibles found in Luigi's Mansion. There are three different colors of Stones, each with its own name: Ten of each color can be found in the mansion, totaling 23,000,000G. One more Green Stone was added to the 3DS remake, making a new total of 23,800,000G. To find all the Stones, 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.
 * Blue Stones aka Blue Jewels (500,000G each)
 * Green Stones aka Green Jewels (800,000G each)
 * Red Stones aka Red Jewels (1,000,000G each)

However, only five of each color can be found in the PAL version's Hidden Mansion as the majority of Speedy Spirits and Gold Mice drop Blue Diamonds instead.

Gems from Luigi's Mansion's sequel, Luigi's Mansion: Dark Moon, bear a resemblance to Stones, though they serve as a collectible rather than an amount of gold they offer.

Trivia

 * When Luigi obtains a Stone, the sprite of him on the Game Boy Horror is his jumping sprite from the Super Mario All-Stars version of Super Mario Bros.