TWSBI Diamond 50 Inkwells

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

2017-12-27T09:31:24+00:00 February 22nd, 2013|Other Reviews|12 Comments
  • Rafael R. Pappalardo

    Any information about the new 50P bottles?

  • You're welcome 🙂

  • No, the Safari won't work. I've tried every other converter I have, and none will fit but the standard international.

  • It's okay! Yes, you keep the inkwell sitting right on the table.

  • That is an excellent point, I forgot about that cone! Well, without the cone, you'd need about 10ml, but with it, you can probably get up to the last few ml of ink out of there.

  • I wish more companies would put inserts in their bottles!

  • They're basically going to be the same bottles, but with plastic caps instead of aluminum ones. They're going to be less expensive, but I don't know by how much at this point. TWSBI has some pictures of them on their Facebook page, but that's about all I know. It's going to be a few months before they have them into production, they're just prototypes at this point. I'll know more about them this Spring.

  • Marlo Gonzales

    You may have missed this, but if you are never going to use the special colored TWSBI/Standard International Converter adaptor, you can put the top black cover directly onto the bottle.

  • Charles Latshaw

    Sorry to resurrect an old post. My three daily pens are two TWSBIs and a Vanishing Point. Will the Vanishing Point converter (which seems to be oddly shaped) work with this bottle? If so, I'm SOLD! Oh, to be able to fill all three pens in seconds with no paper towels…. oh, please.

  • I wish they still made the green and copper! Any way to still find them?

  • Georgia-Alice Bunge

    In some of the pictures of the TWISBI Inkwell, there are seven colours including a beautiful green, orange and purple but you only sell four basic colours on your website and I cannot find them anywhere else either. I like the colours that are left although I am partial to the purple and green but I was just wondering why you still show all seven colours if they are no longer available. If they are available but I cannot find them. Thanks, Georgia

    • Lydia At Goulet Pens

      Hi, Georgia. Sadly, those colors are not available anymore. We have not had a chance to go back and update this blog, as it’s a few years old, but I will suggest that we revisit it and do so 🙂 Thanks for the head’s up.