A 1.70 carat sky blue topaz with 8x6mm blue composite turquoise and 0.27 carats of round white zircon in 18K yellow gold over sterling silver ring - the ring combining sky blue topaz and composite turquoise for a two-blue material dialogue in warm gold. Sky blue topaz provides transparent, faceted blue; composite turquoise contributes opaque, natural blue-green. The contrast of optical types creates interest. Not sizeable.