Hi Olivia,
I agree, that the graduated strand look is very classic; and regaining in popularity among many of our clients looking for a "traditional" pearl strand.
The reason why graduated strands are so hard to find, and therefore available "by request only", is that the are sorted and matched into 1mm graduated strands before vendors import them from overseas... Creating graduated strands would mean much more labor involved on the part of the vendor to select matching strands in different size ranges, cannibalize them for the proper sizes and then rematch an entirely new necklace to meet the client's requirements.
Most vendors will definitey do them "On-Request" though!
