According to the different luster and color of gold, you can roughly distinguish pure gold, k gold, real gold, fake gold. 70% of the jewelry is yellow with green, 80% of the gold is yellow, 90% of the gold is yellow with purple, and 10% of the gold is red. Therefore, there is a formula for "seven green eight yellow ninety-five red, yellow white with gray half gold".
"Copper turns green, silver turns black, and gold never changes color." So the real gold ring is warm yellow, the color is harmonious, the surface is delicate, the color is bright and bright, and the false color is often green and black. And pure gold is soft, generally do not need to do inlaid jewelry, so where inlaid gold jewelry claims 24K, there must be fraud.
Gold is about twice as heavy as the same volume of silver, lead and tin, and the real gold has a drop feel in the hand, while the fake one has only a heavy feeling without a drop. The proportion of gold is 19.3g/cm3, the color is closely related to the proportion, the proportion is close to 19.3, the higher the pure gold. Be wary of big and light gold rings.
3. Test the hardness
4. See rhyme
High-color jewelry, thrown on the cement floor will have a dull clicking sound, and sound without rhyme, no strength, commonly known as dead sound. On the contrary, the gold jewelry with low finish color has a rhyme and a long sound when thrown on the cement floor, and a little bounce.
The surface coating of the gold ring is uniform, smooth and smooth, without defects, mottles, scars, sand and other defects. Welding, lap to smooth, thick. Clear pattern, no double shadow. The lines on both sides are neat and parallel, without teeth. Pattern combination design work coordination, ring each part smooth smooth, no burrs. This is the most simple and intuitive gold ring identification method.
6. Look at the mark
Gold jewelry purchased in the regular business will have their own number, you can log in to NGTC for inquiry, genuine products will have their own information, NGTC is the State General Administration of Quality Supervision, Inspection and Quarantine authorized by law the national professional quality inspection agency for jewelry and jade, which is the most direct identification method.
8. Chemical reagent method
Use the fire to identify the jewelry burning red (do not melt the jewelry deformation), cool to observe the color change, if the surface is still the original gold color is pure gold, if the color darkens or different degrees of blackening, it is not pure gold. Generally, the lower the color, the stronger the color, and all become black, indicating that it is fake gold jewelry. After really burning red, it is quenched into water, and the color is unchanged.