"Ruby is a prefix that can appear on Magic Items, Jewels, and Charms, providing either high resistance to fire or a bonus to Damage (Jewels only). It is the strongest modifier for both fire resistance and damage, but the damage modifier can only appear on magic Jewels (not Rare). Ruby Jewels may have either fire resist or +damage, there are two different \"Ruby\" prefixes for jewels that merely use the same label."@en . . "Ruby (magic prefix)"@en . . . "Ruby is a prefix that can appear on Magic Items, Jewels, and Charms, providing either high resistance to fire or a bonus to Damage (Jewels only). It is the strongest modifier for both fire resistance and damage, but the damage modifier can only appear on magic Jewels (not Rare). Ruby Jewels may have either fire resist or +damage, there are two different \"Ruby\" prefixes for jewels that merely use the same label."@en .