Thank you for submitting your item for appraisal. This appears to be group of various sandblasted glass objects hand decorated by Madeline Thorpe, a multi-talented self-taught artist from Tucson / Pinetop in the White Mountains. Apparently the artist used pre-fabricated glass and decorated it with her very specific technique. To give a vague estimate is difficult, apparently so far none of her glass objects were offered or sold at auction. If offered at the right arts and crafts fair a stem glass would most likley sell in the 20 US $ range, larger objects for more. I am sure the artist sells for higher prices, but the secondary market is quite different. The estimate range is for single pieces, depending on size, colour and condition.