Is dwarven gemstones worth the money?

[Rook]

EDIT: Maybe this will shed a little light:

In-App Purchase Price Adjustments in January 2018 (Android)

Edit January 2, 2018: We have now made the adjustments to the Android in-app purchase prices. As you may know, the prices for the in-app purchases vary between different countries and platforms. The differences are explained by currency conversion rates as well as the value added tax (VAT). Apple automatically updates the prices of the in-app purchases on their platform. We haven’t updated the prices on Android since the game was launched, even though the currency conversion rates have changed…