I find myself asking this question more often nowadays - because I need that for my blog! Sigh. I regret didn't pay much attention to the names of the stones that I purchased. I bought them because I like the look, the feel when touching them and of course the price if it was affordable.
Let's look at these:
They look interesting and I know they are some kind of shell. They resemble Abalone Shell but an expert told me they are just 'plated' Mother-of-pearl. That didn't upset me as I did not pay the price of Abalone Shell. Whatever...I still like them and I have made a cool necklace with it:
This is truely my design - no copycat. Sometimes, however, I do borrow other's idea and modify it - like this cute little necklace:
This was done upon my daughter's request. The original one which she liked very much has been badly tarnished. I modified the design by using different type of beads and connecters and voila! It is even nicer than the original one because of the beautiful butterfly crystals!