Elastic 

Resistant elastic in 0.5 mm 0.7 mm 0.8 mm or 1 mm for heavier beads or stones.

The diameter of the elastic to be used can vary depending on the size of the holes of stones even of an identical size given the different provenances, factories and also of the same factory.

Generally speaking, for Stones in 8 mm we use the elastic in 1 mm, including...

Resistant elastic in 0.5 mm 0.7 mm 0.8 mm or 1 mm for heavier beads or stones.

The diameter of the elastic to be used can vary depending on the size of the holes of stones even of an identical size given the different provenances, factories and also of the same factory.

Generally speaking, for Stones in 8 mm we use the elastic in 1 mm, including for the 10 mm and for the sizes above we double it when we can.

For stones in 6 mm we use the elastic in 0.8 mm or the 0.7 mm (preferably); if it is possible to switch from the 1 mm then we use the 1 mm or the 0.7 mm if necessary. It is best to always use the largest possible diameter.

For stones in 4 mm, we use the 0.7 mm when possible, in which case the 0.5 mm

For stones in 3 mm, we use the elastic in 0.5 mm where possible.