A 0.68 carat square octagonal Paraiba blue apatite with 0.82 carats of round white zircon in 18K yellow gold over sterling silver ring measuring approximately 0.33 inches long by 0.43 inches wide - the Paraiba blue apatite ring in warm gold. Paraiba blue apatite carries the distinctive electric blue-green associated with Paraiba tourmaline but at a dramatically different price point. The square octagonal cut gives the vivid blue-green stone a geometric character. Not sizeable.