1. Weight: The real ancient gold bracelet has a higher density, so it will be heavier than the fake one.

2. Bubbles and deformation: the inside and outside of the bracelet should be complete, without obvious bubbles and cracks. If the surface is uneven or has obvious fine marks, the bracelet may not be real gold.

3. Stamps and seals: Real ancient gold bracelets are generally printed with the manufacturer's stamps and seals. You can look for these signs to ensure the authenticity of the bracelet.

4. Chemical test: If you need to test the authenticity of the bracelet more accurately, you can use some chemical reagents to test its metal composition. However, this kind of test requires professional equipment and skills, and it is not recommended for individuals to try.

5. Official authentication: If the bracelet has a certificate, the authenticity of the bracelet can be verified by the certificate. But if there is no certificate, it doesn't mean it is a fake.

6. Color and folding hardness: The authenticity of gold can be distinguished according to its luster and color. In addition, high-purity gold will leave wrinkles when it is bent, which is called fish scales.

7. Sound: Gold with high color will make a dull and unpleasant sound when it is knocked or thrown, while K gold has rhyme. The crisper the sound, the greater the elasticity and the worse the color.

8. Touchstone identification: Touchstone is a black natural stone, and gold can be drawn on the touchstone. Real gold will leave a golden mark on the touchstone.

It should be noted that the above methods are for reference only and cannot guarantee the accuracy of 100%. If you are in doubt about the authenticity of gold, it is best to seek the help of professional appraisal institutions or authoritative appraisal experts.