[Speedslug]

Tungsten can get red hot and can be used to push a hole in molten glass to put on a chain or chord after it cools.

But be sure to leave enough glass around the hole and take the time after your done shaping it to even the heat distribution in whole piece other wise it will cool too quickly in some places and that may cause it to break apart.

Heat control is really one of the first tricks to learn when you first start out.
Even heating and slow, even, controlled cooling will keep the internal stress from causing it to tear itself apart.