It was a blue sapphire encased in white gold.

这是个曾被白金包裹的蓝宝石。

In order to investigate the colour characteristics of the blue sapphire from Madagascar, the GemDialogue systerm is used for describing and grading the blue sapphire samples.

为了了解马达加斯加蓝色蓝宝石的颜色特征，采用GemDialogue颜色系统对其进行了描述与分级。