As a lot of you know. Gem-knight’s have had their OFFICAL release into the TCG through Duel Terminal. While not legal yet, we are one step closer to playing this archetype. Gem-knight’s are by far my favorite theme ever introduced into YGO. I have been a fan since their original OCG release, and have playtested them from the beginning(going as far as purchasing the cards for real testing!). Originally the deck had no real major strategy beyond summoning one of the 3 Gem-knight fusions. The deck had many good tutoring options but no winning plays. It was setup for slow unreliable fusions, and beatdown. Now the deck has gained a lot of options in later DT sets, with access to Gemini Spark, Obsidian and extremely improved fusions. Finally with the release of Rescue Rabbit, I feel Gem-knight’s is a viable option as a rogue deck in the OCG(and eventually TCG) with explosive Fusion OTKs
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Here is their wikia page for individual cards from the theme.