Wouldn't buy from Diamond Nexus.
*** Hello, Please note that if your ring becomes "dull" we can always polish the metal and if needed replace your Nexus Diamond alternative for free. If a diamond is what you are wanting, you can trade your Diamond Nexus ring in for a 12Fifteen ring. Lab grown diamonds will be essentially the same as mined diamonds just grown in a lab, and at this time will be 50% less than it's mined counterpart. Feel free to reach out to us at Diamond Nexus or our sister company 12Fifteen for more information. -Customer Care Advisor ***