First, look at the color.
The color of the gold necklace will gradually deepen with the purity, so we can judge the authenticity of gold according to the color.
Second, look at hardness.
Hardness is a very important factor in judging gold. Pure gold is soft and has low hardness. You can make a scratch with your nails. Gold with good color is much softer than gold with low color, and a real gold necklace will not break when bent.
Third, weigh the weight.
Weighing is also a good way. Holding the gold necklace in your hand, if you feel a heavy feeling, then the gold necklace is real; If it is a fake gold necklace, it is a light feeling.