natural gemstone的用法和樣例：
例句
- What they use as adornments on their body fall into two kinds, gold or silver articles, or natural gemstones.
所佩帶的裝飾品的質地一方面是金銀物器，另一方面是天然寶石。 - The country's volcanic activity also yields natural gems, such as boiling pools, geysers, and black-sand beaches.
這個國家的火山是活躍的也生產天然寶石，還有沸騰的池塘，間歇泉，和黑沙海灘。
