Coins Earth Set 15 pcs: The gems are block/ opaque, meaning not see-through. Papoose coins are a fun way to explore colours, sparkly goodness and stacking; doubling as stacking blocks with that little bit extra. The set comes presented in a gorgeous wooden tray. The coins are made from Beech wood, the tray is Beech and Plywood (for the bottom). A note on the gems: in some, tiny specks of imperfections are visible. These are unavoidable. There is also a lot of handling that goes on before the actual product arrives in your home, this may also be part of the reason why tiny scratches can be seen on some gems. In working with this product Papoose/Colours of Australia sincerely do not believe this impacts in any way on the play value and it only happens occasionally. Of course, during quality control the bad ones get filtered out. If you happen to get a BROKEN gem please let us know immediately as this is not OK and will be replaced. If you feel you, or your customers, can not deal with these little specks and marks, please refrain from buying this product.