کوراندوم
preferred label: corundum @en
type: Concept
related: یاقوت کبود

گوهر
preferred label: gem @en
type: Concept
narrower: یاقوت کبود

یاقوت کبود
related: کوراندوم
broader: گوهر
preferred label: sapphire @en
type: Concept