Hi Gin,
I reposted your question in the right forum.

About your request, I never heard of "jade coloured" Yunzi stones.

According my knowledge, "original" Yunzi* stones are produced with a special mixture that looks black in direct light. When the black stones are illuminated from behind they shows a dark green colour.

* Yunzi meaning "from Yunnan" that is China province where they are produced

I have seen some double convex Green glass stones here and there.

In Europe you can try here:
http://www.hebsacker-verlag.de/glass-stones-jade-color-215-10-mm-p-4175.html

And this is Amazon:
https://www.amazon.com/Glass-Go-Stones-8mm-Green/dp/B00429AWEO/ref=sr_1_1?ie=UTF8&qid=1480798982&sr=8-1&keywords=go+game+stone+green

Hope this can help, have fun!
Galation

_________________
When you play Weiqi you are joining millions of people across four thousand years of time.
Jonathan Hop - So You Want to Play Go?

FWIW, I have an elderly set of Jade-coloured Yunzi stones, they are single-convex, though

These Yunzi with “Jade luster” are not simply “coloured”: since Yunzi is made of stone powder (molten/sintered), in this case the mixture contains a certain amount of powdered Jade (see also https://en.wikipedia.org/wiki/Yunzi).


<edit>
And yes, the black stones of both kinds of Yunzi stones (“green luster” and B & W) look (dark) green when illuminated from behind—at least mine do, the green single convex ones as well as the B & W double convex ones.
</edit>

_________________
“The only difference between me and a madman is that I’m not mad.” — Salvador Dali ★ Play a slooooow correspondence game with me on OGS?

I knew I can still learn something new by re-posting the message here!
Can you share some picture of this set?
Galation

_________________
When you play Weiqi you are joining millions of people across four thousand years of time.
Jonathan Hop - So You Want to Play Go?

Taken with a cheap camera, so the colours are not 100% accurate

_________________
“The only difference between me and a madman is that I’m not mad.” — Salvador Dali ★ Play a slooooow correspondence game with me on OGS?

Merci beaucoup Mon Amie!
Galation

_________________
When you play Weiqi you are joining millions of people across four thousand years of time.
Jonathan Hop - So You Want to Play Go?

Hhm. Whom are you addressing? Or do you know something about Bonobo that we do not?

_________________
Still officially AGA 5d but I play so irregularly these days that I am probably only 3d or 4d over the board (but hopefully still 5d in terms of knowledge, theory and the ability to contribute).

That “we” would include me also

_________________
“The only difference between me and a madman is that I’m not mad.” — Salvador Dali ★ Play a slooooow correspondence game with me on OGS?

Am I correct in my belief that new sets no longer come with those straw bowls? I think they're being shipped in awful plastic mockeries of those, now.

I have been thinking about getting a set of single-convex yunzi stones. I played with them at a recent tournament in Berlin and completely fell in love with them - the deliberate, unambiguous way that they sit on the board adds "weight" to each move.

At first, I thought that single-convex stones would annoy me because of the need to turn them the right way up before placing them but this became automatic after a very short time. I suppose they might be sub-optimal under severe blitz conditions.

(In Berlin, the stones were awesome but the clocks were dire - plastic jobs with very distinctive, bent minute-hands. Despite 60 minutes main time and to my great surprise, I won 2 of 8 games on the clock that weekend! I'm fairly certain that these outcomes were not caused by material-related things but, if they were, it would have been the clocks, not the need to turn the single-convex stones the right way up.)

Silly me!
This is the incalculable risk of copy&paste automated translations from the web


Sorry Mr.Bonobo!

Galation

_________________
When you play Weiqi you are joining millions of people across four thousand years of time.
Jonathan Hop - So You Want to Play Go?

No worries, nothing to be sorry for—all is well We’re all here for the fun of it, no?
Peace, T♥m

_________________
“The only difference between me and a madman is that I’m not mad.” — Salvador Dali ★ Play a slooooow correspondence game with me on OGS?

They're great for playing out variations on the board - just place them upside down.

I realise I'm a bit late here but thought you might like to see some more photos.

I also have a set of the "jade lustre" single convex Yunzi, purchased from YMI back around 2009 I think. I read somewhere that they stopped making them, though it was just in some forum not an official source.

I measured five of each colour. The black ones ranged from 21.3mm to 22.2mm diameter with a mean of 21.78. They were all 5.9mm thick. The white ones ranged from 21.5 to 22.1mm diameter with a mean of 21.78. The thicknesses of the white stones ranged from 5.9mm to 6.1mm with a mean of 6.0.

I took some photos to show the colour a bit more clearly (though still won't quite be an accurate representation). When I first got them I was actually disappointed that they were so green, I had thought the colour would be more subtle. Now I quite like them as they are, but I'm also wanting a set of biconvex black and white stones (probably glass/ceramic from Japan or Korea).

It's my first post here so apologies if I don't get this image-posting business right:

One more picture: