The TWSBI Diamond 50 Inkwells came out about a year and a half ago, and for whatever reason I just never got around to shooting a video on how to use it! I finally just sat down and did it, so enjoy!

TWSBI Diamond 50 Inkwells, in Black, Blue, Green (This color is discontinued), Orange, Silver, Red, and Purple (This color is discontinued)
TWSBI Diamond 50 Inkwell, completely disassembled from its packaging
TWSBI Diamond 50 Inkwell, closeup of the engraving on the bottom of the glass


This is a 50ml inkwell that is made to fill directly into the body of the TWSBI 530/540/580/Mini, as well as standard international converters. If you don’t have one of these pens, you can still enjoy the bottle, though. If you take off the adapter on the top, you can fill any pen directly into the bottle itself, with the handy cone adapter.

TWSBI Diamond 50 Inkwell, in black
TWSBI Diamond 50 Inkwell, in blue, with top cap removed
TWSBI Diamond 50 Inkwell, in red, with entire cap assembly removed


TWSBI Diamond 50 Inkwell, in silver, with a TWSBI 540 in place to fill
TWSBI Diamond 50 Inkwell, in purple, with standard international converter
TWSBI Diamond 50 Inkwell, showing how a pen fills directly from the bottle
TWSBI Diamond 50 Inkwell cone insert, makes filling a pen easy when the ink gets low

I’d love to hear your thoughts or questions on the Diamond 50! Just hit me up in the comments.

Write On,
Brian Goulet