StrataGem

From the publisher, Playroom Entertainment:

In StrataGem, players strategically form a 3x3 grid with the best combinations of cards to score the most points, using cards with the same type of gems, same number of gems or gem cards that form a numeric straight. A player may overlap as often as they want, but at the end of the game, points are scored horizontally, vertically and diagonally in the grid. But don't get your precious jewels snatched away, when opponents attempt to sabotage you with their Gem Thief cards, which will surely keep you on high alert! Put your thinking cap on, stay cool and collected, and you'll be sure to win the game!

Not to be confused with:

Stratagem (1998)
Stratagem (2014)