gold ornament
1. The surface shall be smooth, free of all kinds of processing marks, and the casting shall be free of cracks and obvious defects. A bracelet should have a straight axis. The chain bodies of bracelets and necklaces do not rotate vertically, and the size of buckles matches the chain bodies. The needle length of pin earrings should be consistent, the chuck should be stable and so on.
2. Identify the mark and weigh it in time.
Usually, gold ornaments are stamped according to the standard, generally in the order of origin, manufacturer code (trademark), material and content. Because of its soft texture and low wear resistance, gold ornaments are easy to wear and lose weight after being bought and worn for several years. When you buy it, the scale is right, which can avoid future doubts. Platinum ornaments
A "look", each piece of platinum jewelry will be engraved with a small Pt logo, which can generally be found in the inner ring of the ring, the buckle of the necklace or the back of the jewelry. It is worth mentioning that platinum ornaments with platinum content above 990% have recently appeared on the market, and the words "sufficient platinum" are directly marked instead of Pt.
Second, consumers can also identify platinum jewelry by weighing. Because platinum is the densest and heaviest metal among precious metals currently used as jewelry.
Three "statements", when buying, you should ask for a Chinese invoice, and ask the seller to provide the name of the jewelry, the name of the jewelry jade material and the weight parameters. Diamonds look 4C.
Diamonds are usually evaluated according to 4C standards, namely, the cut, color, clarity and carat weight of diamonds.
incision
The cutting and grinding process of diamond has the greatest influence on the brightness of diamond. Even if this diamond has perfect color and clarity, poor cutting will make it lose its beautiful color.
colour
The lighter the color, the colorless the diamond, the higher the value and the higher the price.
clean
Diamonds with a small amount of inclusions are very rare and precious. The clarity classification of diamonds is determined according to the size, quantity, location and visibility of their clarity characteristics.
weight
Diamonds are measured in carats. Because large diamonds are relatively rare than small diamonds, the higher the increase index of carat weight of diamonds is. Ruby ornaments
The most important factor that determines the value of ruby is color. The red color of the top quality ruby is imaginable: the tone is very pure, the saturation is good, and there is no secondary tone of brown or blue. The color intensity of high-quality rubies is like burning coke. Ruby is probably the strongest color substance our ancestors have ever seen. The magical power of these flames can be described as follows: these red flames will always burn and never go out.