<table class="attributes-Custom" cellspacing="10">
            <tr>
                <td><span>Stone Shape</span></td>
                <td><span>Stone Size</span></td>
                <td><span>Stone Quantity</span></td>
            </tr>
            <tr>
                <td align="center"><?php echo $_product->getstoneshape() ?></td>
                <td align="center"><?php echo $_product->getstonesize() ?></td>
                <td align="center"><?php echo $_product->getstonequantity() ?></td>
            </tr>
            <?php

                if(!empty($_product->getstoneshape2)
                {
                    echo "test";
                }
                else
                {
                    echo "Didnt Work";
                }

            ?>
        </table>