Throughout history, Hetian jade has been cherished by the Chinese people for its lustrous, soft, and graceful hues, its tough yet delicate texture, and its warm, subtle elegance. Not only does Hetian jade boast a long-standing history, but certain qualities it exhibits have also won widespread admiration. Its fineness, its warmth, its colors, its luster—among these many distinctive features, Hetian jade’s oiliness stands out particularly prominently.

Among Hetian jade, the seed material boasts the best oiliness and the strongest oily luster. But what exactly is this oiliness found in seed material, and what causes it?

What is the oiliness of seed material?

The “oiliness” we often talk about generally involves two concepts: one is the visually oily sheen, and the other is the oily feel when you touch it.

The visual appearance refers to the special matte reflection of light on the surface of Hetian jade, which arises from the unique molecular structure of the jade and gives it an oily luster.

Another aspect is the tactile sensation experienced during everyday handling and polishing. Before coming into contact with Hetian jade, I’d heard people describe its feel as absolutely fantastic. After starting to work with it myself, I’ve come to understand exactly what they meant: it feels like gently running wet hands over a bar of soap—smooth yet not greasy, slick yet not oily.

In fact, both of these points are something we can experience by looking at them and by touching and handling them.

Where does the oiliness of seed material come from?

Oiliness is a key characteristic that distinguishes Hetian jade seeds from other types of jade, such as Russian jade, Qinghai jade, and Korean jade. Jade with good oiliness becomes increasingly oily and lustrous the more it’s handled, exhibiting a warm, smooth, bright, and richly layered appearance. So, how exactly does this oiliness come about?

Hotan jade seed material's " Oily " The visual response of the reflection effect is jointly determined by the crystal structure characteristics, grain size, density, reflectivity, transmittance, refractive index, and surface finish of the material. The size, morphology, and bonding mode of the mineral particles in Hetian jade are all important factors influencing its oily luster.

Hetian jade seed material features extremely fine-grained crystals that, under a polarizing microscope, have indistinct outlines—appearing as if intertwined in a felt-like texture and exhibiting a microstructure composed of short fibers. Its cross-section displays a dense pattern of tiny pits, giving it exceptional light-scattering properties and excellent polishability over time. As a result, it achieves a remarkably high level of brightness without ever producing the stark, flat reflection characteristic of glass. This unique quality imparts a sense of three-dimensionality and translucency to the jade; the more you handle it, the stronger these effects become. In fact, regular handling and polishing by the human hand is akin to a slow, natural polishing process applied to the jade itself—this is precisely why the jade becomes increasingly lustrous and smooth with continued use.

Hetian jade seed material boasts a high degree of density. The combination of this density with fine-grained crystals creates a delicate and warm tactile sensation. The seed material’s reflectivity, refractive index, and transmittance are perfectly balanced, giving the jade a transparency that falls between semi-translucent and slightly translucent. Its surface exhibits a sense of clarity and transparency, while its interior conveys a layered texture that is not entirely transparent.

How to distinguish between Hetian, Qinghai, and Russian jade—everyone, just focus on one character! " Moisture " It’s simply oily. As everyone can see from the comparison, Qinghai material gives a translucent impression—though it’s very white, that whiteness has a grayish tinge, lacking the rich, creamy oiliness characteristic of Xinjiang Hetian jade. As for Russian material, we have to admit at present that high-quality, fine-grained Russian material is extremely rare and commands a very high price. Moreover, it doesn’t possess the same weighty, oily feel as Hetian seed material; rather, it tends to be relatively dry.

The subtle and elegant Hetian jade—its delicate texture and gentle warmth truly “arise spontaneously.”

Source: Xinjiang Jade