This really is a lovely little piece of Harry Potter Film (or even literary!) memorabilia. It's actually much daintier than it appears in the image, and the etchings are quite subtle. For this i give it the highest rating. If buying to be worn as a piece of jewellery then i wouldn't wear it if i did not have an alternative chain to the one it is supplied with. The chain is very plastic-metal like, and it's incredibly sort for the shape of the pendant. I attached my own Egg pendant to a mid-to-long length thin gold chain and it looks far, far better and when worn it's so subtle that people don't just recognise it as necessarily a reproduced Harry Potter prop :)
Solely as an item of collectors memorabilia, i would say it's charming.