The ISS circles the Earth every 90 minutes. It travels at about 17,500 miles (28,000 km) per hour, which gives the crew 16 sunrises and sunsets every day. In the more than 15 years that people have been living onboard, the Station has circumnavigated the Earth tens of thousands of times.
Generally, these beautiful paints are called metallic when they imitate metals like gold, silver, etc., and they are often called Pearlescent or Pearl, when they are other colors like white, blue, red, etc.
This means every grading system used by every company and pearl producer is unique and subjective. It is therefore impossible to compare grades and grading systems from one vendor or producer to another. Super-fine metallic freshwater pearls, courtesy of PearlsofJoy.com.