Literature Reference: 火后见琮璜，霜余识松筠。—— 《送张盥赴举诗》 After the fire, we see the jade treasures; after the frost, we recognize the pine and bamboo. Source from 'Song Zhang Guan Fu Ju Shi'.
琮: An ancient type of jade artifact.
璜: An ancient jade artifact, semicircular in shape.
Meaning: Cong and Huang are ancient jade treasures used in rituals, symbolizing nobility and honor.