jewellery Shop Online Portal

Hi, An online portal is needed for a Jewellery Shop. This will have categories and items just like common shopping cart solutions, but NO online sales. Must be css-based front-end, no tables. on back-end(CMS), i want to add/edit information/categories/items **If you already have a simple CMS, that will be highly appreciated as i need it completed as soon as possible. However, i would like some demonstration available before using a CMS.** No popular/complex CMS solutions like Joomla, as we need to understand and customize all the code later. However, front-end templates made for joomla(or any other) can be used as theme. -- Waqas