The first jade pieces had been quite simple, but as time progressed, more complex designs advanced. Jade rings from between the 4th and 7th centuries BC present proof of getting been labored with a compound milling machine, hundreds of years …
The first jade pieces had been quite simple, but as time progressed, more complex designs advanced. Jade rings from between the 4th and 7th centuries BC present proof of getting been labored with a compound milling machine, hundreds of years …