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The Jewel of Rhaelyx is one of the two component pieces of the Crown of Rhaelyx (the other being the Circlet of Rhaelyx) which provides a 10% chance to preserve resources when training non-combat skills.
The base drop rate of the Jewel is [math]\displaystyle{ \frac{1}{10,000,000} }[/math] per action taken. The drop rate increases by [math]\displaystyle{ \frac{1}{2,500,000,000} }[/math] for each Mastery level you have in any skill, to a max of [math]\displaystyle{ \frac{1}{100,000} }[/math] which is reached at 24,750 total mastery level. After that point, additional Mastery levels will not increase the chance further.