Tungsten-gold theory comes from tungsten alloy. Tungsten alloy used in industrial field is usually called tungsten steel. Later, the tungsten alloy material developed for jewelry making in fashion field was called "tungsten gold". Tungsten gold and tungsten steel are both tungsten alloys, but there are many differences: the content of tungsten gold is much higher than that of tungsten steel; The hardness of tungsten gold and tungsten steel is similar to that of diamond, but tungsten gold avoids the extremely fragile characteristics like tungsten steel because of its special formula. In addition, the gloss of tungsten gold is not only far better than that of tungsten steel, but even exceeds all the metals known on the earth at present.

Cai, the founder of the real men's brand, was the first person to make jewelry with tungsten and gold. In European and American fashion circles, jewelry made of tungsten and gold is extremely popular and expensive. At the 2008 Las Vegas Jewelry Show, tungsten and gold jewelry shined brilliantly, and was praised as "the third kind of gold besides gold and platinum".