In the jewelry industry, R stands for "purity". The purity of jewelry is generally determined by the quality and content of metal. For example, the purity of a diamond is evaluated by "4C", one of which is its "purity", and the letter R stands for "rare", which refers to a high-quality diamond with no or little impurities.

R can also refer to the style of jewelry, for example, designers of some brands specially create a set of fashionable and complete jewelry for R series. These jewels are usually made of noble materials, such as 18K gold, platinum and diamonds, and their classic designs and gorgeous craftsmanship are impressive.

In addition to the above two meanings, r can also refer to the Italian word "lille" in the jewelry industry, meaning "royal" or "noble". This means that jewelers may use R to describe the noble, royal and exquisite quality of some customized jewelry, which is usually specially customized for individual customers, so it is very rare and unique.