Pure silver, is the least cost metal of "Precious Metal" (Precious Metal means the scarced and inert valuable metal. There are three metals in this group: gold, platinum, and silver.) So it is the most-pickable choice to make variety of jewelry nowadays.

The well-known silver jewelry grade is 925 sterling, standed for 92.5% pure silver to be alloyed with other metals (the most famous is with 5% copper and 2.5% zinc.) to be able to form in rigid shape of silver jewelry.

Pure silver is inert, it is not easy to be reacted with other substances, especially oxygen. But other metals that mixed with is likely to be a problem. When your silver jewelry is darken due to the expose of oxidation catalyst (humidity + oxygen + sunlight), if it is "925 sterling" grade, you can just wash with typical dish-cleaning solution in the market (in Thailand we know in the brand "Sunlight") without the need of other special solutions, and dry it with soft cloth.

To be confident with "Real 925 Sterling", you have to purchase from well-known and standard shop or factory (such as the member of government office like Department of Export, or Thai Gem and Jewelry Association) that have "Quality Control (QC)" process (in jewelry industry, there is no any internation standard or accreditation body from third party like ISO to prove jewelry manufacturing quality.) In normal manner, we will stamp "925" on the inside of our silver jewelry to classify this silver jewelry grade.

In Rainbow Silver, as the position of Top 5 silver jewelry manufacturer in Thailand, we have to prove our jewelry to make customer confident. We inspect each jewelry piece carefully, and have high-technology as the "Laser-Inspection Machine" to see the metal component of jewelry in molecular level!

We think that the standard manufacturer has to have the most hi-tech facilities and equipments to please customers the most and on time, and there are just only a few jewelry factories have that!