https://kids.guinnessworldrecords.com en

First man-made diamond

First man-made diamond
Who
GE Research
What
First
Where
United States (Schenectady,)
When
15 February 1955
Working in GE's laboratory in Schenectady, New York, USA, in February 1955, scientists built an ultra-high-pressure apparatus called the “Diamond Press”. Comprising a donut-sized chamber surrounded by conical pistons, it could produce 1.5 million pounds per square inch of pressure and up to 5,000 degrees Fahrenheit. Metal and carbon were melted together using an electrical current and then cooled for between 10 and 20 minutes. The result was perfectly formed man-made diamonds up to 1/10th carat in weight. These diamonds were the first ever man-made object to scratch a natural diamond.