Gold ornaments are soft in texture, red and yellow in color, not easy to pan-color, but easy to wear and deform, and are not suitable for setting all kinds of exquisite gems. Iridium gold is mainly extracted from natural iridium or iridium ore. The color is silvery white, with strong metallic luster and hardness of 7. The relative density is 22.40, which is brittle, but it can be pressed into foil or drawn into filaments at high temperature, and its melting point is as high as 2454℃. The chemical properties are very stable. Gold-plated jewelry is made by wrapping gold foil on the surface of jewelry made of aluminum, zinc and lead alloy, then heating and pressing the gold foil firmly on the product with tools. Gold-plated jewelry is harder than pure gold jewelry, and it is not easy to deform and has strong wear resistance. On the surface, it can be compared with 24K gold jewelry. Palladium is one of the platinum metals. In mineral classification, platinum group metals include palladium, rhodium, platinum and so on. , is a typical "noble family" in metal.

K gold jewelry is made by adding a small amount of silver, copper, zinc and other metals into gold to enhance the hardness and toughness of gold, which can be melted into various colors. The gold content in K gold jewelry is expressed by K value. There are many kinds of pure gold bracelets, including pure gold chain bracelets, pure gold flat bracelets, pure gold bar bracelets, C-shaped bracelets, garlic bracelets, ancient gold bracelets and so on. They are all solid bracelets, and the grams are all above 30 grams, so the solid is not easy to deform. Colored gold, also called colored gold. That is, gold (or K gold) is matched with purple, red, pink, orange, green, blue, brown and black. It is made by smelting 75% gold with copper, aluminum, silver, cobalt, palladium, iron, cadmium, nickel and other metals.

According to different purity, gold jewelry can be divided into palladium (Pd), one of the platinum group metals such as rings, pendants, earrings, bracelets and necklaces, and it is also one of the precious metals commonly used in making jewelry. Because platinum (Pt) is a platinum group metal, it has a high reflectivity to visible light, so it is white, and its appearance color is similar. It is steel white (of course, 100% palladium is the color). Mixed-color gold contains not only silver, but also other metals such as copper, zinc, lead and iron.