Zhè kuài shǒubiǎo shì dùjīn de, bú shì chúnjīn de.
This watch is gold-plated, not solid gold.
Tips
usage
The figurative sense is mildly mocking: a thin layer of gold over an ordinary core. 出国镀金 is a short degree abroad taken for the name, and an official sent to a rural post for a year to earn promotion credit is also said to go there to 镀金.
memory
镀 'to plate, to coat with metal' also gives 镀银 'silver-plated' and 电镀 'to electroplate'.