July Birthstone - Split Shank Natural Ruby Halo Ring for Women with Diamond Accents (7x5mm Ruby) Available in various sizes between size 3 to 13. Please contact us for more info. Prong Setting Rubies are Heat treated for enhanced brilliance and lustre. Free Certificate of Authenticity. Easy Returns - If you are not 100% satisfied with your purchase, you can return it for a full refund or exchange it within 30 days of the shipping date. Returns, including free gifts, must be unworn and in the state that you received them.