precious, valuable, rare
珎 centers on something of high worth or scarcity: precious, valuable, or rare. It describes items or qualities that are treasured because they are uncommon.
珎 is a variant form of 珍. It combines 王 (jade, a precious material) with 尔, which likely serves as a phonetic component. The character expresses the idea of something rare and valuable.
The left side is 王 (jade), a precious stone. The right side 尔 looks like a small, rare object. Imagine a rare jade artifact that is precious and valuable.
For チン, picture a rare chinaware vase made of precious jade: chin -> チン, and the vase is valuable and rare.