use a small sharp tip knife.
You need a small drill to make a hole in the seashell. I find that a Dremmel tool is easiest to work with. Other options are to use a superglue to attach the wire to the backside of the shell. Decide how the shell will fit into your arrangement, then mark the opposite face of the shell to put the wire into. Drill slowly into the shell at the mark and insert the wire into the hole that you made. Twist the wire gently to secure the shell and to not damage a delicate shell. Insert into the arrangement.
The rotating action of the drill bit makes the hole.
"Drills" is the plural of "drill". A drill can be a tool used to make a hole. A drill can be a military procedure.
Drill?
To make a hole in or through, with or as if with a drill.
Some kinds of crafts one can make with seashells are: seashell frames, seashell chimes, seashell angels, seashell collages, seashell lamps and seashell mosaics.
I would use a "hole saw".
Drill bits are not universal. You choose the size of the drill bit according to the size of hole you like to make.
Yes, the safest way is to drill a small pilot hole first. Do not make your new hole in the same section as the old one, turn the shaft around, or flip it over.
the specification of a drill machine is the diameter of the hole it can make.
To make drilling a HOLE (hehe) lot easier
A drill guide is used to make an accurate hole when not using an drill press. When one needs to use a handheld drill on a project, the drill guide will keep the drill bit straight and accurate.