# Carats to Metric Tons (ct to t)

Source: https://www.unitconvertercalculator.com/weight/carats-to-metric-tons/

**1 ct = 2.0E-7 t**

One carat equals exactly 0.0000002 metric tons (2 x 10-7 tonnes). The metric ton, at exactly 1,000 kilograms, contains precisely 5,000,000 carats. This clean factor arises because the carat was deliberately standardized at 0.2 grams, making it integrate neatly into the decimal metric system despite its ancient gemological origins.

## Formula

Apply the conversion factor

## Conversion Table

| Carats (ct) | Metric Tons (t) |
|---|---|
| 10000 ct | 0.002 t |
| 50000 ct | 0.01 t |
| 100000 ct | 0.02 t |
| 500000 ct | 0.1 t |
| 1000000 ct | 0.2 t |
| 2500000 ct | 0.5 t |
| 5000000 ct | 1 t |
| 10000000 ct | 2 t |
| 25000000 ct | 5 t |
| 50000000 ct | 10 t |

## Units

### Carat (ct)

A carat is a unit of mass equal to exactly 200 milligrams (0.2 grams), used for measuring gemstones and pearls. Adopted internationally in 1907 by the Fourth General Conference on Weights and Measures.

### Metric Ton (t)

A metric unit of mass equal to 1000 kilograms. Used for measuring heavy loads, cargo, and industrial quantities.

## Background

World diamond mine production averages roughly 130 million carats per year, translating to about 26 metric tons of physical diamond weight. For comparison, global gold mining produces about 3,000 metric tons annually. Diamonds are far rarer by weight, yet their total annual production fits comfortably in a single shipping container. This conversion matters for mining industry reports where production is summarized in both carats and metric tons.

## Good to Know

The metric ton has been the international standard for heavy commodity measurement since the mid-20th century. In the diamond industry, the juxtaposition of carats (for individual stones) and metric tons (for annual production reports) is a constant reminder of the industry's dual nature: artisan craft at the retail level and industrial-scale mining at the source. De Beers' annual reports routinely switch between the two units within the same paragraph.

## FAQ

### How many carats are in one metric ton?

One metric ton (1,000 kg) equals exactly 5,000,000 carats. This clean number results from 1 carat being exactly 0.2 grams and 1 metric ton being 1,000,000 grams.

### How does the metric ton differ from other tons?

The metric ton (tonne) is exactly 1,000 kilograms. The long ton (imperial) is 1,016.05 kg, and the short ton (US) is 907.18 kg. The metric ton is the international standard used in most scientific and commercial contexts.

### How much is the world's annual diamond production in metric tons?

Global diamond production is roughly 130 million carats per year, which equals about 26 metric tons. This includes both gem-quality and industrial diamonds. Gem-quality stones represent a smaller fraction by weight.

## Non-Frequently Asked Questions

### If my car weighs 1.5 metric tons, how many carats is it?

Your 1,500 kg car weighs 7,500,000 carats. If it were made of diamonds instead of steel, it would be worth roughly several trillion dollars, but the ride quality would be terrible and parallel parking would give you anxiety on a whole new level.

### Could I swim in a metric ton of loose diamonds?

A metric ton of diamonds would occupy about 284 liters - roughly the size of a large bathtub, not a swimming pool. You could sit in it but not swim. And with each diamond being a hard, angular stone, the experience would be more like sitting in expensive gravel than a luxurious bath.

### Why is the carat-to-tonne conversion so clean?

Because the 1907 standardization committee chose 200 milligrams (0.2 grams) specifically for metric compatibility. If they had kept any of the historical carat values (which ranged from 189 to 215 mg), the conversion to tonnes would produce ugly decimals. Sometimes standardization committees get things right.

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## See Also

- [Metric Tons to Carats](https://www.unitconvertercalculator.com/weight/metric-tons-to-carats/)