Victorian Opal Halo Ring in 12k Rose Gold.  This Victorian opal halo cocktail ring in 12 karat rose gold is a lovely piece of history. The center opal is creamy white, while the halo surrounding it features robins egg blue cabochon cut opals. The contrast between the different opals themselves as well as the rose gold prongs and basket make this such a dreamy cocktail ring to gaze at!