You both have a strong dynamic pull bringing you together; however the relationship tends to extremes. You may find it extremely compelling finding a mate who appears so opposite and at other times you may have difficultly understanding your partner. Gemini has a stronger focus on their immediate networks and environment whilst Sagittarius will tend to focus on the bigger picture and more foreign realms. Learning is one thing you both have in common and you can have some great conversations where you share your worlds with each other. When there is a good flow of movement and exchange of ideas and travel, there can be a great degree of happiness and fulfillment in this relationship.