Jade eye pearl

In merman Sacred City, Fang Yuan sees a mermaid receive a jade pearl from a male Gu Master. The pearl is rare, like glowing jade, and has the shape of an eyeball. Experts do not treat it as valuable, and Fang Yuan has no use for it as a mortal material, but for the rank two male Gu Master it is not easy to obtain this rank four Gu material jade eye pearl. ^{ch. 1663}

The mermaid receives it in public as acceptance of his love, then places the pearl into her mouth. That action means she has accepted his proposal, and the crowd cheers. ^{ch. 1663}