What does it mean that the diamond ring is engraved with G750D0092ct?

G750 gold watch 18K refers to a synthetic metal containing 75% gold and 25% precious metal. The white surface is electric, and it will fade to light yellow after a long time, because this is the weight D0.092CT of the diamond with a watch in its true color, and the carat (CT) unit of the diamond is 1ct = 0.2g = 100.