<?php

                                                    $args = array( 'post_type' => 'product', 'stock' => 1, 'product_cat' => 'earrings-ring', 'posts_per_page' => '12','order' => 'DESC', 'paged' => $paged );
                                                            $loop = new WP_Query( $args );
                                                            while ( $loop->have_posts() ) : $loop->the_post(); global $product; ?>

<h3>Pages:
<?php previous_posts_link( '&laquo; PREV', $loop->max_num_pages) ?>
            <?php next_posts_link( 'NEXT &raquo;', $loop->max_num_pages) ?>
 </h3>
</div>
<?php wp_reset_postdata(); ?>