Jade is one of the three skins released in the Tiny Jack and the River Brawl offer. It could be purchased as part of an item deal for a limited time in February 2017.
Jade could be purchased for $19.99 in the "Best Deal!" which included the Tiny Jack skin and either 50000 coins (Browser) or 1800 DNA (Mobile). This skin was not available for individual purchase and may not be available for purchase in the future.
Details of this skin may vary depending on location, platform or time.
Note: Tiny Jack and the River Brawl offer was released again for a limited time in early April 2019. This time the price for the Best Deal was lowered to $9.99 and the amount of included coins was reduced to 30000 coins. The package of DNA was no longer an option on either platform.