Erllo 5.5 Carats Cushion Cut 925 Sterling Silver Sona Diamond Cubic Zirconia CZ 3 Stone Engagement Wedding Ring

Are the stones in the ring he treated before purchase?

Will this ring last a long time? I don’t want it as a replacement like some people do & I'm hoping it will last.

I have purchased my second ring and both of them seem to have loose stones. when i shake it, i can hear something moving. is this normal

Is it okay to bake this ring in the oven?