I am thinking about getting the Whiteflash by the yard diamond necklace. I have heard that the diamonds sometimes flip and am just wondering about the quality as well. I've read all good reviews about Whiteflash.com but am just wondering if anyone has it and what their opinions and reviews are. It would be really helpful! I am worrying about the how the flipping diamonds will look. Does it stay on the neck pretty well and not flip too much? Thank you!