My lady and I enjoy playing Gem Swap together. Since there are no provisions for this we made up our own. We divide the board vertically and each play on our own side. If you do not have a move you may cross over to complete a move of 3 or more jewels. If you cannot make a move you must pass. The only thing lacking is individual score keeping. We both have a busy life and carry our iPads every where we go. We play while waiting for our food or any time there is dead time. Surprisingly no one has complained. A lot of time this is the only time we spend together.
There are a few additional rules that we have made up but you can tailor them to suit your needs.