Our first stackable ring collection is a three-piece set that you can wear in many different ways. It consists of our three delicate rings Phoibe, Theia and Atlas. In total, there are 18 diamonds and one beatiful white opal that stands as the center piece. Combine two or all three of them to create a marvelous eye catching stack with numerous possible combinations. bling. gems stand for sustainability and are 100% conflict-free. Our revenue funds projects in Africa to support communities that have been hurt by the natural diamond industry. Click here for more information bling. diamond 0.22ct Clarity: VS-VVS, Color: D/E/F, Cut: Excellent bling. opal 3mm Sustainable lab grown opal, identical to its natural counterpart Recycled yellow gold Solid 14k (585) Sustainably sourced, exquisitely crafted All bling. diamonds with sizes 0.5ct and above are certified by the world's largest third-party gemological institute.