For me
DMD Diamond has been my highest-earning "hidden gem" for years now.
I of course had always tended to look out for coins named after game assets such as diamonds, rubies, sapphires and emeralds, but what really got me started on DMD was back when a centralised exchange called Cryptsy started to restrict withdrawals.
They shut down BTC withdrawals while DMD was still possible to withdraw, so I made my exit from that exchange in time before it totally collapsed by piling all the capital I had there (probably almost all already being profits by then) into DMD to withdraw it.
I cannot now recall how long after that it was that DMD made the move from v2 to v3, but by the time that move was completed, which introduced so called "master nodes" or "masternodes", I had enough DMD to fire up a bunch of them.
I didn't bother retaining DMD v2 for the
Galactic Milieu, and also did not put the new DMDv3 into real use in the milieu either, at least not as a one-to-one token representing the actual coins, because I didn't want to encourage people to leave the coins "on an exchange" (that is, leave them bailed-in as tokens) unless prepared to somehow give them the benefit of the staking.
I did start setting up toward doing them as a sort of "traded fund", where the tokens would be shares of a fund that would accumulate staking rewaards from the coins in the fund, but am not thrilled by that approach either. For one thing shares are securities so are probably something best kept fictional as in being only game items not to be confused with "real life" shares, and that means keeping them on a clearly game platform, meaning on HORIZON but not on STELLAR, at least until what problems "real life securities" might face becomes clearer and a simple clear way to get past those problems arises.
When the 2017-2018 bear market hit, DMD is what carried me through.
Sure its price was in the next few years often so low it didn't seem worth selling the staking earnings, but that just meant I was able to put more into "master nodes" in those years.
For the last few years DMD has been working on its version 4, DMDv4, which has taken a long time because they kept aiming the goal higher and higher. It is a "hidden gem" mainly in the sense it has been aimed at perfecting itself rather than at advertising itself.
DMDv4 is ETH-compatible but much faster and with much cheaper fees.
Do your own research into it, I'd be interested in hearing what you think of it.
For me it is something that has worked so well, for so long, even through the worst of times, that I have not even looked into making any ETH-type tokens (which I anyway wonder about the efficiency of due to how its tokens seem to be implemented, compared to blockchains where tokens are native rather than a kludgy thing put together by "smart contracts") until I can do them on the DMDv4 chain.
-MarkM-