Pietra Dura Table with Irises, Made in Italy, Bencini, 1928

This is a beautiful Italian pietra dura and iron table featuring a central blue and white iris. The irises are made of inlaid stone, including lapis lazuli (blue petals), chalcedony (leaves), and alabaster or marble (white petals). Sometimes referred to as painting in stone, pietra dura requires painstaking attention to the selection of the hardstone (for color, variation, and veining); delicate cutting of the surround (black marble in this case, likely backed by slate) and individual pieces; and a fitting together of the myriad pieces into a seamless mosaic. The stone underside of this table is marked, Made in Italy, Firenze, Gen. 1928, "Bencini".

All comments are welcome, especially help identifying the various stones used in this piece.