My grandmother liked "Swiss Lapis", and I have a few examples - a brooch set with a lovely large smooth-polished oval slice of it, a ring, and the beads such as are used in a necklace shown in The Bead Jewellery Book" page 33 near the centre of the page.
Unfortunately because of the yellowish background in my book one might not trust the colour as shown but it is indeed a deep but not very strong greenish version of blue, entirely opaque but not dark enough to be what I would call teal. They seem to use a jasper that starts off grey.
I would be ready to accept that the colour has been added in the way you have named "Beizen".
Perhaps someone may recognise the colour as similar in intensity to "Airforce blue" but slightly greener...?
Will do some more digging, when I get a minute...
Stefany