Liu uses semi-precious stones because of his conviction that the material in a piece of jewelry is merely a medium for the expression of the design.
他說明，傳統中國人偏愛瑩潤的珠玉，而不喜浮光扎眼、炫耀奪目的切面寶石，他也承襲了這個觀念。至於使用半貴重珠寶，他笑說：「這是因為我買不起太貴重的珠寶！」