A designer can always duplicate the same or similar work over and again...it has nothing to do with creativity. A supplier of mine, for example, may have sapphire stones of the same exact size and shape that I can order over and over again. However, I have the option of creating a design that will be replicated, such as in an everyday collection piece. When a certain stone is in little supply, I may opt to build one piece and leave it alone. I've had my eye on a few gemstones throughout the years, assuming they'd always be accessible, only to find out they've been discontinued. It would make me appear unprofessional if I accepted an order and then returned to say I couldn't make it. A one-of-a-kind stone is one that is only accessible once or has a form and/or size that I can only obtain once. I recently purchased three pairs of salt and pepper diamonds to use for simple stud earrings. The stones did match, but I will never be able to get them in the same size and form again. Because the stones are unique in this way, each pair of earrings will be one-of-a-kind.