The Gachala Emerald is the uncut emerald crystal weighing 858 carats (172 g) that is at the Smithsonian.
According to the site, below, the largest cut diamond is The Golden Jubilee which weighs 545.67 carats. The largest raw natural diamond is the Cullinan, weighing in at more than 3,000 carats.
the largest pearl ever found was 31893.5 carats
995.2 caratsI think the one above might be one earth but there is this diamond that is in outer space the is 1x10^34 carats. a link to it is hearThe Cullinan Diamond is the largest diamond ever found and was a whopping 3,106.75 carats!
From Wikipedia: "The Cullinan diamond is the largest rough gem-quality diamond ever found, at 3,106.75 carats (621.35 g)."
Within the limits of the Crater of Diamonds State Park, within which records are kept, you can read from the list below that the largest diamond found to date weighed over 40 carats.
2267.96185 carats.
30,000 carats.
7 CARATS
There are roughly 2,267 carats in a pound.
About 141.7 carats per ounce.
5 Carats.
1 ounce is 138.29 carats.