what was the bigest size RED diamond ever found in nature?

The Moussaieff Red diamond weighing 5.11 carats. The GIA states, "It is the largest Fancy Red, natural color diamond that we have graded as of the date the report was issued."

The Moussaieff Red Diamond is a diamond measuring 5.11 carats (1.022 g) with a triangular brilliant cut (sometimes called a trillion or a trilliant cut), rated in color as Fancy Red by the Gemological Institute of America. While this may seem relatively small when compared to other famous diamonds, the Moussaieff Red is, in fact, the largest Fancy Red the GIA reports having rated. The Moussaieff Red is reported to have been found by a Brazillian farmer in the mid-1990's as a rough of approximately 11 carats. The diamond was purchased and cut by the William Goldberg Diamond Corp., where it went by its original name the Red Shield. It is currently owned by Moussaieff Jewelers Ltd.

The Moussaieff Red was displayed as part of the Smithsonian's "The Splendor of Diamonds" exhibit, alongside The De Beers Millennium Star, the world’s largest top colour (D) internally and externally flawless pear-shaped diamond at 203.04 carat (40.608 g) and The Heart of Eternity, a 27.64 carat (5.528 g) heart-cut blue diamond.

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