Use the mouse to click on on the 2 adjacent gem trade role, making the 3 and above the same valuable stones right into a line can be deleted, otherwise not able to trade position 2, three
How to play Ancient Jewels:
Click on two jewels to interchange them and make a vertical line or horizontal row of 3 or greater jewels of the equal color to clear them and any stone slabs below them. Dispose of all of the stone slabs to finish each level. Unique combos gets you special strength-ups, which you could combine along with your jewels that will help you clear them.