Because the Derinium Gem hardly ever gets drawn, it can be used essentially to take up space in a gem pouch. This effectively results in the other gems in the pouch having increased chances of being drawn. For example, if a gem pouch with 10 slots has one Derinium Gem, each of the other 9 gems have an 11.1% chance of being drawn, instead of the normal 10%. At character level 50+, with level 50 Gem Handling combined with the use of Beriali Gemstones, it is possible for your normal-weight gems each to have a 2.38% chance of being drawn, instead of 2.00%. In this particular case this amounts to a specific gem being drawn 19% more often than it would if you had no heavy gems and instead left those eight gem slots empty. The usefulness of this gem, combined with its low skill level requirement