Hi Frans, the des on auction did not state that is is a sapphire on the top coating, copied from the actual auction = A thin layer of precious opal, onto one face of which is fixed an opaque base of natural or artificial material. Onto the other face is fixed a clear, domed top to magnify and also protect the opal. The better quality triplets have a clear quartz top, others a clear plastic top. Neg rating is therefore not justified, i return it with kind.
It is an honour to be the first seller to give Frans his first rating!! A friendly and professional buyer with good communication!! Thank you for your support!!