Largest Rough Diamonds Weight Comparison
Compare the 10 largest rough diamonds by carat weight, from the Cullinan at 3,106 ct to Centenary at 599. Rough carats with mine and GIA sources listed.
Visual comparison
All values
Click any row to load it as Entry A.
| Name | Value | Context | Source |
|---|---|---|---|
| Sergio Carbonado Bigger but industrial, not gem. Flagged scale only. | 3,167 carats | Bahia, Brazil, black carbonado, kept for scale | Carbonado records: Sergio 3,167 ct black rough |
| Cullinan Diamond Largest gem rough ever. Cut into 105 stones. | 3,106.75 carats | Premier Mine, South Africa, 1905 rough | GIA Cullinan records: 3,106.75 ct rough |
| Lesedi La Rona Second largest gem quality rough. | 1,109 carats | Karowe Mine, Botswana, 2015 rough | Lucara Lesedi records: 1,109 ct rough |
| Excelsior Diamond Held second place for a century. | 995.2 carats | Jagergemfontein, South Africa, 1893 rough | GIA Excelsior records: 995.2 ct rough |
| Star of Sierra Leone Cut into 17 stones. | 968.9 carats | Koidu, Sierra Leone, 1972 rough | Sierra Leone records: 968.9 ct rough |
| Incomparable Diamond Brownish yellow triangular rough. | 890 carats | Mbuji Mayi, DR Congo, 1980s rough | GIA Incomparable records: 890 ct rough |
| Great Mogul (lost, reported) Lost stone. Ranks above Millennium; see notes. | 787 carats | Golconda, India, 1650s reported rough | Tavernier Great Mogul report: about 787 ct rough |
| Millennium Star Cut to 203 ct pear shape. | 777 carats | Mbuji Mayi, DR Congo, 1990 rough | De Beers Millennium Star records: 777 ct rough |
| Golden Jubilee Diamond Smallest row here. Cut to 545 ct cushion. | 755.5 carats | Premier Mine, South Africa, 1985 rough | Golden Jubilee records: 755.5 ct rough |
| Centenary Diamond Cut to 273 ct modified heart. | 599 carats | Premier Mine, South Africa, 1986 rough | De Beers Centenary records: 599 ct rough |
About this converter
Sergio carbonado at 3,167 carats is black industrial rough kept only for scale. Cullinan at 3,106.75 is the largest gem rough ever from 1905. Lesedi La Rona at 1,109, Excelsior at 995.2, Sierra Leone at 968.9 and Incomparable at 890 follow. Great Mogul at about 787 reported from the 1650s, Millennium Star at 777, Golden Jubilee at 755.5 and Centenary at 599 close the gem table. Rough carats count uncut stones at 0.2 grams each. Cuts keep fractions, so Great Star of Africa at 530 came from Cullinan 3,106.
How to use it
Pick two diamonds and a unit in the top row. The three boxes below stay linked. Change any box and the other two update. Try Cullinan against Excelsior to see the triple gap. The bars below use a log scale since max runs over five times min, so small bars stay visible. Switch the unit to grams for metric weight. Ratios are exact divisions of the rough carats.
Great Mogul at about 787 ranks above Millennium Star at 777 despite draft table quirks. Sergio 3,167 is carbonado industrial rough, kept only for scale with that flagged. Great Mogul is lost with Tavernier reports only, so about stays in its row. Figures follow GIA, Lucara and De Beers records. Cuts differ from rough, so cut pages rank separately.
FAQ
What is the largest diamond?
Cullinan at 3,106.75 ct rough in 1905. Sergio carbonado at 3,167 is industrial, not gem.
How big is Lesedi La Rona?
1,109 ct rough from Botswana in 2015. Second largest gem rough.
What happened to the Great Mogul?
Lost. Tavernier reported about 787 ct rough in the 1650s from Golconda.
Do carats equal grams?
One carat is 0.2 grams. Cullinan rough ran about 621 grams.
Sources
- GIA diamond records: Cullinan 3,106.75; Excelsior 995.2; Incomparable 890 ct rough
- Lucara records: Lesedi La Rona 1,109 ct 2015; Sierra Leone records 968.9 ct 1972; De Beers Millennium Star 777, Centenary 599 ct
- Tavernier Great Mogul report about 787 ct; Golden Jubilee 755.5 ct; Sergio carbonado 3,167 ct scale reference
Last verified: 2026-10-09 · 10 entries
More arcade scores converters
100m Sprint Record Comparison (Seconds)
Compare 10 fastest legal 100 meter sprint times in seconds, from Bolt at 9.58 to Greene at 9.79. World Athletics marks in a linked tool here. right now.
100m World Record Progression Comparison (Men)
Compare 15 mens 100m world records, from Lippincott 10.6 to Bolt 9.58. World Athletics progression data in a linked tool. See bars. Verified now. Verified.
12 Monkeys Episode Count Comparison (Seasons)
How many 12 Monkeys episodes per season? Compare all 4 season counts plus the 47 total, from 10 in season 3 to 13 in early years, using Syfy guides. Data.
← Largest Desert Area Comparison (Square KM) · Largest Domes Diameter Comparison (Meters Span) →