Topic: Turquoise slag glass pressed compote tazza stemmed bowl - poss missing a lid

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I've not a clue.  I've been through Pamela's site, looked on google etc but can't even find a pattern match to the shape never mind one in turquoise slag glass.
I've just added malachite  for future searches, but it's not malachite because it isn't green, it's definitely turquoise.  It's a stunning deep bright colour not as green as it looks in the photos, definitely turquoise.
The base rim has lots of wear but is polished.  The foot is raised and hollowed to about the start of the bottom of the stem. 6" diameter at rim 6" in height.
It has a slight edge around about 3/4" below the rim so I thought it might have been lidded maybe?
The colour that looked similar was in CH British Glass - Greener Slag glass spoonholder page 352.  I also found a basket with a similarish pattern design of the diamonds - it's not the same but it's the closest I could find
http://englishpressedglass.com/greener-glass/
Help needed please
m

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http://www.1st-glass.1st-things.com/gallery-slag/slides/turquoise-slag-glass-vase.html
this looks to be a similar colour - I've found it very hard to find anything in turquoise at all.
Edward Moore griffin vase in turquoise slag glass.
Simba has one in plain glass here - the diamond design around the top isn't the same as my compote, but it's a similar theme
http://www.glassmessages.com/index.php/topic,46854.msg263492.html#msg263492
m

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http://www.worthpoint.com/worthopedia/davidson-sowerby-greener-blue-slag-139323503
This blue bowl has lots of similarities as well although again the pattern is a similar style but not exactly the same.
Attributed as 'English, Davidson, Greener, Sowerby guaranteed 100years old'  so not much help there then 
The seller comments as well, that it may at one time have had a lid.  Which is what I thought about mine coincidentally.
Anyone recognise this pale blue one or the pattern on it please?

And this jug on Wayne's site has a similar petalled foot rim that looks to also be 18 petals - Davidson
Did Davidson make this turquoise slag?  The loops on the stem of mine going down to the foot also remind me of some Davidson Pearline patterns.
http://www.20thcenturyglass.com/images/items/victorian_glass/slag_glass/slagglass_jug01.jpg
http://www.20thcenturyglass.com/glass_encyclopedia/victorian_glass/malachite_slag_glass.htm

and the beaded little flower on this unmarked one is the same as on mine - sorry I can't get the links to work properly, it's the pot on the right second from bottom row.
http://www.20thcenturyglass.com/glass_encyclopedia/victorian_glass/malachite_slag_glass.htm

many thanks
m