Glow In The Dark:The pendant needs light to charge.Direct sunlight or a strong light lamp is perfect,the stronger the light is and the longer it's left under the better and longer-lasting the glow will be,will add more charm and personality to your apparels. Crystal Matching Heart Necklaces:You will get 2pcs hexagonal crystal pendants and a pair of magnetic heart clasp,they will mutual attraction when being close,means couples will closely connected and never separated. Material:The crystal matching heart necklaces are made of natural stones and luminous material that can be charged as many times as you want,safe and reliable,smooth to touch,sturdy and durable for long time wearing. Size:The length of the chain is 15inches+2.76inches(38cm+7cm)extension chain,the crystal stone about 1.57inches(4cm)in length. Wide Application:You can use the crystal pointed quartz pendants to make exquisite jewelry and send as gifts to your lover,family members,friends on birthday, Valentine's Day,Christmas,Thanksgiving or other special day