Is the enhancement guaranteed?

Absolutely...

The Gemological Institute of America (G.I.A.) has found that the Yehuda Clarity Enhancement Process is durable and permanent under normal wearing and cleaning conditions. The only way a Yehuda enhancement may be reversed is under the heat of a jeweler's torch or when exposed to extremely strong acids or bases. To help protect your diamond, every Yehuda Diamond has a built in signature that can be seen under 10 x magnifications. This will alert any qualified experienced jeweler to handle your diamond properly should you ever need your jewelry repaired with a torch. In the extremely unlikely event that your diamond should ever need to be re-enhanced for any reason, the Yehuda Diamond Company will restore your diamond's enhancement at no charge.

No Questions asked.

Guaranteed.