Blue ground

Blue ground: Unoxidized rock in diamond pipes.
Blue-white: A term that has been used to refer to a diamond without body color. Unfortunately it is applied frequently (incorrectly and fraudulently) to diamonds that have a distinct yellow tint.

Blue ground and Diamonds and here.
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Blue Ground, Blueground
Unweathered kimberlite rock, normally diamondiferous, and named after Kimberley in South Africa.
Blue White, Blue-White ...

Now feel the deep blue grounding energy of sodalite, and allow it to cool and calm you.
Finally, put your attention on the clear quartz. This is the mirror of your soul; this is the deepest expression of yourself.

Wells quickly scaled the wall and extracted from the blue ground what appeared to be a large diamond crystal.

The "blue ground," as the rock in which the diamonds are found is called, seems to have been forced up from below, perhaps as the material of a mud volcano, bringing with it the diamonds, garnets, zircons, ...

kimberlite The igneous rock that most rough diamond is found in. Also commonly called blue ground.

The Kimberly diamonds were originally found in decomposed kimberlite which was colored yellow by limonite, and so was called "yellow ground." Deeper workings encountered less altered rock, undecomposed kimberlite, which miners call "blue ground.

[6] Kimberlite deposits are known as blue ground for the deeper serpentinized part of the deposits, or as yellow ground for the near surface smectite clay and carbonate weathered and oxidized portion.

See also: Stone, Table, Crystal, Carat, Cut