Tungstenworld.com offers a wide variety of tungsten rings, and while they have an impressive selection of designs and styles, custom-designed tungsten rings may not be explicitly mentioned on their website. However, many suppliers in the tungsten jewelry industry can accommodate custom orders to a certain extent. This often includes options such as engraving, selecting specific finishes, or choosing unique inlays. It would be wise to explore the current options available on their website to see if any customization features are listed. Additionally, specific details about customization may vary, so checking the product descriptions and contacting customer service directly for any custom requests is advisable. To find out about the possibilities, you may want to review the "Contact" section on their site for any direct inquiries regarding custom designs.