The Gem Wedding is, in history, the very first wedding taking place for the Gem race. The final chapter in My Little Universe: Season 7 revolves around this event.
The wedding specifically mirrors that of a typical Human wedding, including roles of the Flower Girl, decorators, the best man, and others being apart of the event.
History
In the finale of Season 7 "Dearly Beloved", the whole chapter revolves around both preparation and the playout of the Gem Wedding, with Ruby and Sapphire being the bride and groom. Numerous people attended the event, including the Harmony Gems, The Diamond Authority, along with the residence of Beach City and Ponyville.