Currently on an 18" curb chain but 16, 18, 20, and 24" Cobra SP and GP avaqilable, so if you would like something different on the pendant of choice, I will change it for you. I will try to be accurate with the stone types, but I'm going by a written description and could be wrong. The picture of each necklace is the one you will receive. Moss agate is a solid white agate with mixed green mossy like lines on the outside of the stone from India. Check out my other items.. I will happily combine purchases paid together within a 7 day period. 5% Goods and Service Sales tax is required within Canada.