In the Immortal Realm, the exchange rate between immortal stones and immortal crystals is 1:100.
That is, 1 supreme-grade immortal crystal equals 100 top-grade immortal crystals, which equals 10,000 mid-grade immortal crystals, or 1 million low-grade immortal crystals.
A mere Myriad Realms Token cost only 1 billion low-grade immortal crystals, which translated to just 1,000 supreme-grade immortal crystals.
Chapter 580