这块钻石有鉴定书吗？

Does this diamond come with an appraisal?

本鉴定书不考虑国家及经营人差异。

The certification takes no account of the state and operator variations.

她胆怯地 走到坐在桌边的女士面前，手里紧紧握着毕业证和鉴定书。

Nervously she approached the lady at the desk, holding her certificate and testimonials very tight.