A lovely early medieval glass drinking horn, L6th-E7thC and Lombardic, made N. Italy: http://www.metmuseum.org/collection/the-collection-online/search/468980?rpp=20&pg=37&ft=glass&pos=731&imgno=0&tabname=label …pic.twitter.com/EN5VJWIOVK
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This programme rings a bell but not entirely sure. I remember the jeweller saying that with modern techniques they would still struggle and the cost for the item would be £500k conservatively..pic.twitter.com/DzqzN3lDVO
I'll try to track it down for you 
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