Absolutely love this pen! The pen writes super smooth and looks stunning as well. I haven't tinkered with it yet (I like to disassembled and reassemble these types of pens) but love it so far.
The packaging is super pretty too, it makes a pretty stand. Speaking of the stand, the wrench and silicone grease are found in the white section of it. You need to take the clear bottom off the white stand to get to it.
Wasn't mentioned but I knew cause a co worker had the pen and asked me to look at it 😆😆😆

The pen is beautiful, well made, and light in the hand. I’ve been doing long writing sessions and it does not tire you out. The pen is easy to fill. The nib is smooth and ink flows really well! I was so impressed I bought another one in different color!!

This is my second pen, I already own the white with rose gold. No fatigue. This is my go to.

The fine nib is perfect for me and flows amazingly.

Freakn love this pen! It is so smooth. I like to write with this. It was a big change from writing with the fine point. The color is amazing.

Outstanding products. All of them. Waiting for the next delivery and hoping my internet goes down at least for a day so I can hold off on ordering another Goulet product. Been a customer for about 16 years. Always great products, the best prices and unmatched service. And no I’m not related to or employed by Goulet.

Wonderful product as well as prompt, delightful and wonderfully reliable service.

Goulet Pens Co. provides excellent service, and fast shipping. I am a repeat customer as a result. The TWSBI 580 Diamond rose gold smoke is a very high quality fountain pen and what caught me is the piston filler. Having a clear body to see the ink is also a great plus. This is my second TWSBI and I enjoy writing with them both. I highly recommend Goulet Pens Co. to anyone wishing to start their pen collection or expand it.

This is my first Twsbi semi- disappointment because I worked around the issue. Today (10/23/26) I tried to fill this fountain pen for the first time and the piston did not work. I worked around this issue by using a syringe to fill it because I'm hesitant to disassemble this pen. It writes as I hoped so I can still use the fountain pen. The packaging was also missing the wrench and silicone. I'm not shipping it back. It still writes okay, and its a nice looking fountain pen and I can still use it.

Wanted to love this fine nib. But it constantly skips and doesn’t write.

The story: I inherited a Parker Sonnet Fine from my father that i've been using for some time. Recently, i wanted to try some scented inks with it. I bought a bottle of Jacques Herbin Noir and tried it with the Parker. The ink was wet and it gushed forth like a deluge. It cut deep into even my heavy, premium notebook paper, nearly visible from the other side and feathering upon every other word. Despite this, the scent of the Noir had grown on me and I opted for something finer to tame this ink instead. I chose the TWSBI diamond EF as it was affordable and looked very similar the Parker that has become nearly part of my perception of self.

The first days of my relationship with the diamond was ... tense. My lines were very light on the page, almost illegible and the constant scratching was unpleasant. i felt like a Sumerian scribe chiseling cuneiform on clay. I missed dearly the silken writing experience of my Parker. Yet, i persisted. Maybe the problem lies with me. Maybe i never understood the different beauties of different pens.

Now, i'm about 10 pages in and we've formed a mutual understanding, perhaps even a possibility of fondness. I've noticed my writing pose is a bit odd - i hold my pen quite vertically, almost 90 degrees. In this position, the diamond performs very poorly - it barely applies any ink. I had to rest my writing position at a more conventional 45-60 degree angle and then, my lines became darker, more consistent, fluid. No longer am i carving the words down with determination, they now seem to part with the pen willingly. We've agreed to have me write in this pose in the future and the diamond has been wonderful to use since.

The only thing that still bothers me about diamond is getting started. given the fine nib i chose, at the start of the day, i need to spend considerable effort to unclog the pen before it flows naturally - i haven't tried with other inks so perhaps its an ink problem.

I still miss writing with my parker, its bold, smooth strokes. But, the light, ephemeral lines of the diamond are growing on me. In the unlikely chance anyone asks for a EF steel pen that works hard and has a mature temperament, i'd tell them to find a diamond.

Beautiful pen, very smooth. A great addition to my collection

This pen is awesome! I love how smooth it writes and how it feels in my hand.

Very nice experience

This is my first fountain pen and I think, so far, it's been a really great start! The body of the pen feels good in the hand, a nice weight, and it looks professional enough for work. The nib is a little thicker than I expected, so in the future I think I'll try an , but ink flows beautifully.

I sent a rating but something happened. I looked for the packers name to rate excellent but couldn’t find it. I really like the 580 stub. Wonderful service and I plan to buy more

I love these pens! They write like silk. The ink flows without any problems. I have other pens that probably cost a lot more, and they dry out and give me all kinds of problems. Not these!

So far, so good. Enjoying the demonstrator feature. Nib writes smoothly. And the pen has a good solid feel in my hand.

Great service. Fast delivery and well packaged

I originally gave this pen a solid five stars. Having lived with it for a few weeks now, I have to give an update. (I can't edit my original) It's beautiful, don't get me wrong. But it does feel like I'm writing with a nail. There's no other way to describe it. I don't blame TWSBI. I'm just learning more and more about my likes and dislikes as I explore fountain pens and I enjoy a bit of give from the nib. And this one feels almost like its pushing back against my hand.

The recipient of this gift was very pleased. Prompt delivery and easy ordering.

I have to say, it's much smaller than I excpected. The pictures, and even some videos, make it look like it's a chunky one. But it isn't. It's actually a bit smaller than my Narwhal Original Clear Demonstrator. But it is very nice.

The best fountain pen I've ever had. Writes smoothly, is easy to fill, and the fine nib is just perfect—my first and for sure not the last TWSBI.

This is my second TWSBI 580, have the Iris model. The nibs perform
beautifully, even on stock copy paper. The rose gold/black combination
gives a sophisticated flair to the pen. What's not to love...

I like my TWSBI Diamond ALR, medium nib pen with smoke and rose gold trim.The pen slides across the paper effortlessly and smoothly making my script look so pretty.

Fine nib is a little more fine than anticipated, especially compared to my monteverde dakota. Even so, very happy!

Love this pen! After a forty-year hiatus from using fountain pens I've taken them up again. The Diamond 580 in smoke and rose gold was the second one I bought after a Lamy Safari and have not been disappointed. It looks great and writes even better.