With a deeply etched band, large blue topaz and goldtone accents, Lagos offers up a ring that will bring your look into focus. Designed by Lagos. Stone dimensions: 12 X 10.5mm. Sterling silver/blue topaz. Imported. Most gemstones, including blue and black diamonds, are treated to enhance their luster. Some treatments are temporary and may require special care. Ring Size Chart. Photo may have been enlarged and/or enhanced.