Blue topaz rings in .925 sterling silver.
The blues. Sky is palest, Swiss a brighter mid-tone, London the deepest. All three are the same stone treated differently — the price difference is treatment, not rarity.
Sizing. Sterling silver can be sized by a jeweller. A band set with stones all the way round generally cannot.
See also silver topaz bracelets, topaz earrings, stackable rings and all Rings.