What is our traditional "quest"
Pearls, manau, crystals and jade stones are the heritage of our country. This is not comparable to the “four precious stones” recognized in today's world. The reason is that ancient visions and perceptions are very different from those of today. In ancient times, for example, manau and pearls were often cited as precious stones. In fact, the modern manau is not very valuable, because of its high productivity and widespread use, it can only be considered an ordinary jade stone, but because some manau's garbs and diverse colours, particularly the strange choreography, are the fine “partners” of the masters of the jade, who are known as the "ghost ax" and who use it to carve art treasures, the value of which is remarkable。
I know the mark on the ring inside
Did you notice the mark in the inner circle when you picked out the diamond ring? In general, jewellery rings sold at regular jewellery shops are marked in the inner circle. For example, a diamond weighs 0. 23 ct and a diamond ring of platinum colour pt 900 should be marked with the words “pt 900, 023”. Consumers can be identified on the basis of these markings against commodity price tags and test certificates. In the case of an 18k gold ruby ring, the inner circle shall be marked with the words “18k or 750”. Seeing these doesn't help your selection。
Identification of gold
The identification of gold, through modern technological means, is very easy, but for consumers in general, it can only be identified through folklore to see color。
In the past, it has been common practice to measure the approximate amount of gold, which can be seen in the approximate colour of gold when it is a mixed black mineral, such as carbon-bearing quartz and protein. Whether it is natural gold or gold manufactured, the colour changes with the ingredients it contains. Pure gold: bright dark yellow, thick yellow; silver gold: lighter colour, light green; silver more than 25% gold: white: white; copper gold: darker colour and red color; silver copper gold: yellow; zinc, copper, nickel: white gold。
There's a comparison. The weight of gold is 19. 3 grams per cubic centimetre, which is twice the weight of copper (8. 5 grams of brass), which is distinct, and is self-evident if the weight of the luminum is compared. The gold is not afraid of fire. It is known to everyone. It is red in the fire, and when it cools, it is gold if it is still yellow, and if it is black, it is fake。
Real gold has a low hardness of less than 3 (0-10 degrees) with light teeth, leaving teeth marks. The lower the color, the harder it is, the higher the color, the softer。
