Hi, I see this is an older posting. Did you find the information that you were looking for? I just got my first glass from them today. I ordered it Sunday, today is Wed! Good fast shipping. The colors are awesome, I have not been able to find beautiful deep rose and amethyst color like these anywhere. I held it next to my morretti glass and it makes the morretti look dull and washed out. I played with a bunch of the colors today and had a ball. If you'd like to go to their website its
www.devardiglass.com. Their shipping is so reasonable!!! If you would like to ask me about colors I will be happy to chat with you.