Oh, I’m sorry … I must confess that I had only read the first half of your post

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“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?

You can look for stones in "agate". I've gotten mine from a french store for 260 euros, black and white included.

Here are 10mm ones for 258 euros : http://www.variantes.com/pierres-jeu-go ... 70026.html
There are 8mm ones for 215 euros : http://www.jeudego.com/catalog/product_ ... cts_id=242

They are made in China.
The black ones are opaque and extremely shiny. The white ones are translucent with a yellowish tint, some of them display faint, barely visible stripes.
I guess that the black ones are made of artificially stained agate.

I had to make a demonstration of the game of go in a local forum, and I mistakenly took the agate stones instead of the glass korean ones. I setup a board with several stones for display, next to the 9x9 initiation board.
They were shining bright under the many lamps of the hall. Quickly, two little girls came and asked if they could get a stone for themselves
I said, oh no, they are for playing only.

Hi,
I cannot recommend, since I never tried to buy from, but there are some offers like this: https://www.aliexpress.com/item/Tiger-eye-20MM-20PC-Natural-Stone-round-Beads-Charm-top-quality-cabochon-no-hole-Fashion-beads/32729465687.html?spm=2114.10010108.1000013.1.662f49c8n7Om4m&traffic_analysisId=recommend_2088_1_90158_iswistore&scm=1007.13339.90158.0&pvid=5c10ee7e-fd4d-4e76-bd3a-1e65d23da887&tpp=1 from China direct import sites. Sometimes you can find better prices too.

Galation

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