Price of emeralds, diamonds and rubies.

Hello! I've been away from cubic castles for over a year and I just joined back. I'm wondering, how much are Emerald blocks, Diamond blocks and Ruby Blocks? I'm currently selling Emerald blocks for 25c, is that an okay price?
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Ruby: 1/25c
Those both seem to be pretty common prices anymore, although ruby changes every once in a while. :)
This is already a few years ago, thus a bit outdated.
Per Jacky's question...Diamond/Emeralds are much easier to find in the mines than Rubies. I know, Diamonds should be the most valuable if it were like RL. But Diamonds/Emeralds can be found in Mountain, Arctic, and Forest Mines. The only Rubies I've found have only been in Tropical Mines with Volcanoes (though maybe they are in all Tropical Mines). Can't remember if I've found any gems in Desert Mines...but if I have, they were probably Diamond/Emeralds. All gems can be found in Caverns, but they are singles in there, and not worth the price to mine because of the cost of the bombs needed to dislodge them (especially true since the bombs are now twice the price they were before they were craftable). My goal with using bombs is to blow up at least two and preferably three gem blocks to make it profitable to mine/sell them.
Diamonds/Emeralds: 15c