When Nanyang Jinzhu is irradiated with strong light, the center of the pearl may appear red. This may be because the color of gold beads is deposited on the bead core, which leads to the dark color of reflected light from the bead core. In addition, if the material of the bead core itself is red, the bead core may also appear red under strong light.

Please note that jewelry appraisal requires professional knowledge and skills. The above information is for reference only and cannot replace professional appraisal. If you need to buy or identify jewelry, please seek professional help.