New lavender blue egg, engraved all over with leaves, no gilding, slightly larger and a slightly different shape to the other eggs, hollow and very light about 100gms compared to the red one for example, which is about 360gms. So presume not crystal? lovely and unusual colour. Label on the base says Hand work St Petersburg Russia in English.
Just adding this information I've come across in case it becomes relevant somewhere down the line:
This one with the same label says that particular gilded egg was made 1992-1995 and says in the listing
'
Manufacturing of Russian glass eggs have stopped.'
http://www.ebay.ie/itm/Russian-Glass-Egg-Gold-Painted-Vintage-Egg-Red-Egg-St-Petersburg-Handmade-/282157897785?hash=item41b1ebd839:g:lTgAAOSwEjFXc5AzA different listing for another egg here says this
These type of eggs were produced in St - Petersburg, Russia during some time ago, but now they discontinued and so become more and more rare, so take this opportunity now to get it for your own collection. Hand blown (hollow inside) and hand carved glass, painted with gold color, deep blue (cobalt) crystal glass, size (height) 10 cm / 4 inch, diameter (in the middle) 7 cm / 2.8 inch. Has a sticker of an artisan manufactory "Crystal Art" from Saint Petersburg in the bottom (the manufactory itself is now dissolved).'
http://www.ebay.ie/itm/FABERGE-GLASS-EGG-WITH-IMPERIAL-EAGLE-HAND-ENGRAVED-FROM-ST-PETERSBURG-RUSSIA-/191773857873?hash=item2ca69cd851:g:GFAAAOSw3ydV1gWgI have still managed to find some that are from shops though so at the moment (with my very limited understanding) it doesn't look as though all Russian production has stopped (particularly since I've found a maker of some with link posted earlier in thread).
The Corning appear to have trade catalogues (?) that seem to have been published in 2000(I'm being very vague as I'm not entirely sure what they are):
http://rakow.cmog.org/vwebv/holdingsInfo?bibId=69635'
Hand blown and hand-etched crystal/glass eggs created in St Petersburg Russia.
Bibliographic Record Display
DatabaseThe Rakow Library Catalog
Author:Alexandra International, Long Island, NY, USA.
Other Author(s):Alexandra International.
Title:Hand blown and hand-etched crystal/glass eggs created in St Petersburg Russia.
Publisher:Long Island, N.Y. : Alexandra International, 2000.
Description:[8] p. : ill. ; 28 cm.
Notes:Cover title.
Includes Imperial Crystal and Grand Duchess egg collections.
Record Number:69635
Subjects:Alexandra International--Catalogs.
Cut glass--Catalogs.
Trade catalogs. '
This is an item listed as part of the 'Grand Duchess' collection
http://www.ekaterinas.com/anastasia-blue-grand-duchess-collection-crystal-eggThe listing says made in Russia.