Brilliant Red
From the name I was expecting Brilliant Red to be my "red by choice" but it has not. It comes across a little too subtle for my liking. I find myself liking Classic, Poppy or Ruby as colours with the punch that I prefer.
Yes it is a true red in that there is not an orange tone thatis evident of some of the reds available.
The colour swatch from the Diamine web site is fairly representative of the colour I found in using the ink.
Cerise
There is a little bit of violet added to this colour, and it is not a true red ink.
Nevertheless, it looks good on personal notes.
The colour swatch on the Diamine web site shows this to be a little more red than what I found in using the ink.
Classic Red
This is a classic red in terms of having no orange tones, as one can be found in some red inks.
It is a true red and for me it is a bit of a toss up between Classic Red and Poppy Red in terms of colour preference.
Oxblood 
A new colour by Diamine, when I started to use this ink I mmediately thought of a pair of Oxblood shoes I used to have!
Bold strong colour, this colour does not whimp out on the page. Good performance in a variety of pens. Drying time were reasonable.
Maroon
A lighter tone among the reds.
Looks good on cards and personal notes. Good flow and dry times.
Monaco Red
With the addition of some browns this becomes a very interesting red.
I have used this ink for both business and personal notes and cards and it looks good.
Good flow, dries in a reasonable time.
Colour swatch on the Diamine site is very representative of the colour tone I found in using the ink.
Poppy Red
I like using red inks, and I prefer the reds that do not have orange tones. This one very nicely suits that preference.
This is a real rich, dark red with no blue or orange undertones.
Kept its true colour even on very broad strokes with broad nibs.
The colour swatch from the Diamine web site is very representative of the colour in actual use.
Red Dragon
A bold new red by Diamine Ink.
I have grouped with with the reds, but there is more going on with this colour than a straight forward red. You see the blue in the ink when you open the bottle and this colour leans towards a beautiful burgundy.
The flow is good. It dries on the paper in a good time. I have used it in various pens in its first week of a workout and I have not come across any issues.
The colour sample on the Diamine website is a fairly good representation of this colour, although the website colour makes the ink look warmer, more of browns in the colour, than my experience in writing with the ink.
Ruby Red
Wow, I may have found the perfect red! Dark, rich, flows on the paper very nicely.
No undertones in the ink even when used with a broad nib.
Syrah
One of the new colours (2010) that is very interesting and it looks good in both personal and business writing.
I have grouped with with the reds, but there is more going on with this colour than a straight forward red. You see the blue in the ink when you open the bottle and this colour leans towards a beautiful burgundy.
The flow is good. It dries on the paper in a good time. I have used it in various pens in its first week of a workout and I have not come across any issues.
The colour sample on the Diamine website is a fairly good representation of this colour, although the website colour makes the ink look warmer, more of browns in the colour, than my experience in writing with the ink.
Vernillion
When I first wrote with this ink I had classified this as one of the orange inks. The ink has very light tone and is subtle in character.
When I looked at the colour swatch for the ink on the Diamine web site I saw real reds in the colour representation. It turns out Vermillion, by definition, is a red pigment/colour so I have grouped this ink with the red.