Mine is mainly for research on plasma chemistry, so it's not set up for maximum deposition rate, which is an important parameter for commercial viability. I've made a 3.8 ct. unpolished stone in a 4 day run. If I were to do the laser trim (gets rid of the off-orientation edge growth) and send it out to be cut and polished, it would yield a nice DF brilliant-cut stone of ~ 1.25ct. weight. At retail, that might sell for ~$10K.

Systems optimized for commercial production will get to that weight in less than 24 hours with multiple substrates. Typically, they'll grow 10 - 25 stones at once. They do this by using much higher microwave power (typically 30-60kW) at a lower frequency (915MHz) which gives a larger plasma so they can cover multiple substrates. My system is 2kW @ 2.45GHz (same as microwave ovens), so its throughput is non-commercial. But it's a nice research tool for investigating how plasma chemistry affects diamond growth. And it's fun to grow diamonds in my garden shed! :-)