The color yellow is the nearest color to light.  It shines outward and radiates energy.  Therefore, it is assumed that Lemon Quartz activates.  It is said to balance and strengthen your clarity, happiness and communication.  The butterfly is a symbol of transformation or change.  This necklace is 14kt gold filled and the butterfly does have trace amounts of lead so I would keep it away from children!  Chain is 30″ long without a clasp, butterfly is 2″ (can be shortened).