Hey Jennifer, is my sister's name also so got my attention and will try to look into it for you. I have never shopped the gauranteed stores for jewelry as I know to get it from personal reccomendations. Saying that means I don't know what they are Guarantee-ing. It could be price on that item on that Island on that cruise, or be the quality. If you have a copy of the Guarantee advertisement email it to me..I will leave if you post back and try to direct you to who to speak with. Please do have it appraised at a profesional jeweler. And keep in mind buying it from you price is different than selling it to you price. Hope this helps.
Best to all,