The most recent results of the study at Chuckalonghorn University indicate that the best sand would be Desert Sand.
Rounded quartz grains (covered with rust-colored hematitic pigment) plus biogenic and lithic fragments from the Dubai Desert, United Arab Emirates. Biogenic grains clearly indicate that the sea can’t be very far away.
As improbable as this sounds, the UAE has a huge surplus of this type of sand which can be shipped anywhere in the world even at a cost comparable to domestic sand. Due to it's superfluidity characteristics Desert Sand can be pumped from its source, when mixed with water, and deposited into a ship and later pumped onto a beach. The question remains if this recommendation will be implemented.
chuckalonghornuniversiity/sand/th