Hex London Blue Topaz EarringsThe 18K yellow gold settings and halos of diamonds give these earrings the sparkle to follow you from day to night. DETAILS 18 karat yellow gold London blue topaz 4 carats approx. Diamonds 0. 50 carat approx. Post backs for pierced ears Length 0. 6 inch Width 0. 6 inch approx. London blue is regarded as the most valuable of the Topaz. The color varies from a medium to dark grayish blue, sometimes described as "steely" or "inky". At Syna, we love how