Recognize the session layer of the OSI model ; List the seven layers of the OSI model ; Discuss the responsibilities, functions and protocols of the session layer ; Specify the six session layer protocols
Currently, the most popular color for this gem is the blue zircon. Most blue zircon, which is considered an alternate birthstone for December, is normally a pastel to medium blue in color, but some exceptional gems have a bright blue color. Beyond blue, Zircon is also available in green, deep red, yellow, brown, and orange.
1 Zircon (from browny to reddish or blue, from green to blue or yellow). 2  Tanzanite (a variety of zoisite) is an emblematic case: it originates in nature, an undesireable brownish-yellow color, only after the heat treatment those stones will get the worldwide-known beautiful purplish-blue color.