Even though he studied hard for his jewelry business and gained a lot of knowledge and experience from his mentors, there were still many times when he lost money.
Previously at an underground trade fair, for example, he bought a highly sought-after raw stone for over two hundred thousand. Yet, he discovered that the stone's actual value was a mere few thousand.
That incident became the talk of the industry for a while. After all, you needed Lady Luck on your side to succeed in the business.
Even under the guidance of highly-experienced mentors who had decades of experience, he was not safe from unfortunate circumstances like this. Jiang Yao, however, must have had luck and a hidden ability to determine the valuable stones, despite her random pickings.