Yes, there are many different qualities of sawblades. Although many
will give their favorites, my main suggestion would be to not buy the
cheapest ones. You want ones that will cut straight, and have the
strength to last a while when cutting. Spend the money on good
sawblades, they are well worth it.
The blade sizes will be important, depending on what you are
cutting, the thickness of the material, and the detail you need. For
most of our work we use a 3/0 blade, but for finer work I’ll
recommend a 5/0. Cutting off sprues would need a #0. For cutting
carving wax, I’ll use a # 10. These are all personal recommendations,
and each metalsmith will have their own preferences, in both brand
and blade size.
My recommendation is to learn to use the sawblade to pierce out your
designs with such precision that you won’t need to use a file. In the
finer detailed piercing, the only tool small enough to get into the
sawn openings is… a sawblade.
Keep that blade tight, don’t push forward very hard, use a light
touch, try to keep the blade vertical, and listen to the even sound
of the cutting strokes with your ears.
Good luck. The jeweler’s saw is a profoundly useful tool, and a
supreme joy to master.