求翻译：应该说那段历史本应是中国钻石业发展的绝好机会，因为当时钻坯价格相对便宜，加工小钻，加工费占钻石成本的12%-20%，是非常有利可图的。是什么意思？

It should be said that history should be the development of Chinese diamond industry an excellent opportunity, because it was relatively cheap blank drilling, processing small diamond, diamond processing fees accounted for 12% -20% the cost is very profitable.

It should be said that this should be a part of the history of China's diamond industry development, good chance because at that time relatively expensive, rough diamond processing small diamond, diamond cost of processing fees accounted for 12 per cent to 20 per cent, is very profitable.

Should say that phase of history originally should be the Chinese diamond industry development exceedingly good opportunity, because at that time drilled the semifinished product price relative small advantage, processed slightly drills, the processing charge accounted for the diamond cost 12%-20%,

It should be said that history should be a great opportunity for the development of the diamond industry in China, because rough diamond prices relatively cheap, small drill processing, the processing cost of diamonds cost-12%, is very profitable.

It should be said that history should be a great opportunity for the development of the diamond industry in China, because rough diamond prices relatively cheap, small drill processing, the processing cost of diamonds cost-12%, is very profitable.