User blog comment:Ninjablademaster/Top 10 Weapons in Shadow Fight 2/@comment-24329676-20140607113842/@comment-26222249-20150328024551

Unfortunately in the latest update every coin unobtainable weapon requires gems now.

In the previous update you just had to purchase the gem weapon then you could keep upgrading it as much as you wanted with coins. Unfortunatelly Nekki scrapped that idea.