This is a Sri Yantra crystal grid made out of Birch wood. These are made to order, you can choose between approximately 6 and 12 inches in diameter. This is just for the grid, stones much be purchased separately.
The Sri Yantra is a form of mystical diagram, known as a yantra, found in the Shri Vidya school of Hindu tantra. The diagram is formed by nine interlocking triangles that surround and radiate out from the central (bindu) point.