Inclusions: The natural jadeite pattern you can see within natural Jadeite which may look like streaks, spots, or cracks is naturally formed millions of years ago.  Commercial jadeite B,C, & D Grade is bleached to remove inclusions that are not wanted, like black spots. A Grade Jadeite is natural, and untreated.Chime: Jadeite chimes like a bell when struck with anything metal. The finer the grain , the higher the chime. Real untreated natural jadeite has very fine grain and a very high chime. The higher the pitch of the Chime is one of the tests to determine the quality of jadeite. Also see "stone lines" below.Stone lines: Geological pressure during the jadeite evolution causes the structure of the jadeite to be different throughout. You can see this in all jadeite under 10x magnification, and you can often see it without any magnification. It looks similar to cracks in ice and it might look like a crack, but is not a crack. It is called a healed crack that is naturally formed. "Fine grained" jadeite has fewer of these natural lines, and the "chime" is higher pitched depending on the grade of jadeite. See "chime" above.Grains: Inter-granular cracks in the fibrous structure of natural untreated genuine jade or jadeite. is not cracked or damaged, it is the way it was formed from mother earth, a natural occurrence in jade.JADE FACTS:Jade derives its name from the Spanish 'piedra de hijada', meaning 'stone of the loins', so called because of the belief that it could cure ailments pertaining to the loins, or kidneys. It has been held in high esteem by the Chinese since ancient times and was carved into beautiful love tokens and talismans and believed to promote longevity.  The earliest decorative artifacts found include simple discs or buttons but jade was also used in prehistoric knives and weaponry. Most commonly occurring in shades of green, nephrite jade can also be creamy white - 'mutton fat' jade.