The gem diamond: colorless diamond, due to the large output, and is a colorless, so itself will be out for a diamond alone all categories.

钻石：无色的宝石，由于钻石的产量很大，而且本身又是无色的，所以将钻石单独拿出来归为一个类别。

The modeling procedure using the grey forecasting model GM (1, 1) which is applicable to original series with equal intervals is introduced, then an output model of synthetic diamond is established.

介绍了适用于等间距序列的灰色预测模型GM(1,1)的建模步骤，预测了我国的人造金刚石产量。