George,
 
I bought a shell just like yours this last year from The Shell Shop in Morro
Bay.  The data slip stated:
                The Orange Cardium
                Cardium bechi
                by diving off Masbate Is.
 
Now, I'm not very good with world geography, so I don't know if this Is. is
close to Cebu or not.
 
Cathie
Fontana, CA   USA