Does Lao Fengxiang have a certificate of gold jewelry?

Yes. Gold jewelry and silver jewelry have the same certificate.

There are many ways to identify gold ornaments, and China folks have summarized a set of simple methods. The formula is: look at the color, weigh, listen to the rhyme, fold hard, grind on the stone, compare the cards, point with acid and fix the color. The first four sentences rely on perception and feeling; The last four sentences need tools and reagents.

The density of gold is 19.32g/cm3, which is about twice as heavy as that of silver, lead and tin with the same volume. Available formula: the mass (gram) of a certain gold jewelry is equal to the density compared with the volume (cubic centimeter) of a certain gold jewelry. Calculate the density of the measured gold jewelry. If the density is about 19.32g/cm3, it is pure gold or relatively pure gold, otherwise it is impure gold or colored gold (this method is not destructive to jewelry).

Extended data:

Gold maintenance method:

1, cleaning chemicals will change the color of gold, so take off the gold ornaments before cleaning.

2. Avoid direct contact with volatile substances such as perfume and hair gel, otherwise it will easily lead to the fading of gold ornaments.

3. Take off the gold ornaments when swimming to avoid chemical changes on the surface after contact with seawater or pool water.

4. Wrap it in flannel and put it in a jewelry box when keeping it to avoid mutual friction and damage.

5. Gold is soft and easy to deform. Do not pull necklaces and other accessories to avoid deformation.

6. Pure gold jewelry will react chemically when it encounters mercury, and white spots will appear. When cleaning, as long as you barbecue under the alcohol lamp for a while, it will return to its original color.

Baidu Encyclopedia-Jewelry Appraisal Certificate

Baidu Encyclopedia-National Certificate of Quality Supervision and Inspection of Gold and Silver Products

Baidu encyclopedia-gold jewelry