金刚石的商业价值随着其纯度和透明度的增加而增加,然而它们的科学价值则常常取决于其所含的矿物包体。据Daniels 等(1996)报道,在金刚石中发现了主要在富含粘土的变质沉积物中出现的十字石包体。他们认为由于金刚石只能形成于深度120km 或地球的更深处压力下,因此这是对一段时期以来地质学家根据同位素研究提出的推断确定无疑的验证,即大陆壳矿物再循环进入地幔。 The commercial value of diamond increases with its purity and transparency, yet their scientific value often depends on the mineral inclusions they contain. According to Daniels et al. (1996), crustal inclusions occur in diamonds that occur predominantly in clay-rich metamorphic sediments. They argue that since diamond can only form at depths of 120km or under deeper pressure from the Earth, it is a clear validation of the inference made by geologists since a period of time based on isotopic studies that continental crust minerals are recycled into the mantle.