1.gd is the abbreviation of "Jinlong Jewelry Co., Ltd.", and Jinlong Jewelry is a company engaged in the research and development of gold jewelry. When you say gd, you should mean that it is produced by Jinlong.
2. And 9999 pure gold is 999.9‰, and the average gold bar is 9999. This number represents the purity of gold, 9999 is 10 thousand gold, representing the purity of gold is 9999. And 999 is pure gold, and the purity of gold is 999 per thousand. Are collectively called pure gold.