If you're referring to the huge aquamarine, Meghan has it. Harry gave it to her as a wedding gift and she wore it to their wedding reception. William got the sapphire.
I dont think it is the same ring. she wants you to think it is the same ring. people are posting side by side comparisons. Of course , she could have changed it but I doubt it.
Someone on twitter predicted she would pull out this ring after Kate wore the 15 million dollar “headband “ choker.