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What does the LD0,13ct on Zhou Shengsheng mean on the 18K diamond ring?

Live selling gold, how does gold look good and false, do you need to make any lights? What light, how big, a few, friends suggest that I use a spotlight, and I tried the natural light and ordinary family lighting light gold jewelry that did not look like gold. Essence Essence Ask for help

Make a batch of gifts for the company's anniversary celebration