I would deliver them the infamous quality over quantity story my mother taught me. Purchasing something with higher expenses gives you this sense of responsibility, and pride. I am guilty of purchasing cheap jewelry for convenience and in return, the rings rusted and disappeared within a week. I have two rings in particular that I spent more money on, and I know their location at all times. Quality over quantity is the key, teach them what you learned.

Keep them in good spirits, because finding a ring you love is such a spectacular feeling and you don't want to disrupt that. Keeping them in that period of joy, and preparedness to purchase is vital. You compliment them and give them a second to savor the ring, and then you deliver the news but use words such as luckily to make them feel like they are just on the grasp of losing the ring, but in return you could have them the exact one in two to three short weeks. The words you use are important because you want to give the ears what they are listening to. I would say, " I believe you found the one, It compliments the finger profoundly. In terms of sizing, at this moment, we do not have your exact size, but luckily we can have your ring here in 2-3 weeks. Trust me, the wait will be worth it. "

Professionalism is key, any customer expects to be compensated in some sense. I believe the first step would be to assure them that you are listening, aware of their dislike, and apologetic. Then you reassure them that your brand is determined to deliver a positive experience to all costumers and that you are continually looking for feedback, and then instruct them to leave a message to the company email, and that you would love to talk about what to do better, or if company allows issue a refund.