14k white gold.  21.3 X 16.3mm. Set with genuine lab-grown diamonds.  1/2CTW. SI1-SI2. G-H.  16"-18" adjustable chain. 
 
Pictured in the video clip are the medium and large sizes of The Light.
 
Also, available in platinum or yellow gold. 
Set with natural diamonds per request for additional fee.
 
SCRIPTURE
The one who is the true light, who gives light to everyone.
-John 1:9