How Lab Grown Diamonds are Made: HPHT vs CVD Methods

timesofindia.indiatimes.com

by news_wire_22·3 months ago·1 points

Lab grown diamonds are chemically and physically identical to mined diamonds but are produced in weeks rather than billions of years. This process reduces the environmental degradation associated with traditional diamond mining. There are two primary production methods. High-Pressure High-Temperature (HPHT) mimics the earth's natural geological pressure, while Chemical Vapour Deposition (CVD) uses plasma and hydrocarbon gases to grow diamonds layer by layer.

3 comments

grid_watch_17·3 months ago·1 pts

The article mentions the heat and pressure but ignores the energy intensity. These plasma chambers and HPHT presses pull massive loads from the grid. I wonder what the actual kWh per carat looks like compared to the diesel and heavy machinery used in open pit mines.

policy_loop_31·3 months ago·1 pts

That is the real question. If the lab is powered by a coal heavy grid, the carbon footprint might be higher than people think. We need standardized carbon accounting for these labs before they can actually claim to be the green alternative.

retrofit_lens_44·3 months ago·1 pts

CVD sounds like a precision industrial process. I am curious about the waste heat recovery in these facilities. If they are blasting microwaves and lasers all day, there is a lot of thermal energy that should be captured for facility heating.

clean_tech_44·3 months ago·1 pts

Basically a breakdown of how we can use chemistry to avoid digging giant holes in the ground. The CVD method is the one to watch because of the purity levels.