Crystal and stones » demantoid http://www.crystalandstones.com Properties of natural crystal precious stones, birthstones, gemstones, lithotherapy, crystal healing, chakras Sat, 28 Jan 2012 13:06:41 +0000 en hourly 1 http://wordpress.org/?v=3.3.1 Garnets to Malachite http://www.crystalandstones.com/physical-properties/isolate-gemstones/group-a-b.html http://www.crystalandstones.com/physical-properties/isolate-gemstones/group-a-b.html#comments Wed, 16 Sep 2009 14:11:33 +0000 precious stones http://www.crystalandstones.com/?p=32 Group A. Isolates gems with a specific gravity of 4.7963 and over 4.70; in this group is placed zircon, with a specific gravity of from 4.70 to 4.88.

Group B. Stones whose specific gravity lies between 3.70 and under 4.7963.

Garnets, many varieties. Almandine 4.11 and occasionally to 4.25 Ruby 4.073 ” 4.080 Sapphire 4.049 [...]]]> http://www.crystalandstones.com/physical-properties/isolate-gemstones/group-a-b.html/feed 0 Specific gravity of gemstones http://www.crystalandstones.com/physical-properties/specific-gravity.html http://www.crystalandstones.com/physical-properties/specific-gravity.html#comments Wed, 16 Sep 2009 13:53:09 +0000 precious stones http://www.crystalandstones.com/?p=23 The fixing of the specific gravity of a stone also determines its group position with regard to weight; its colour and other characteristics defining the actual stone.

This is a safe and very common method of proving a stone, since its specific gravity does not vary more than a point or so in different [...]]]> http://www.crystalandstones.com/physical-properties/specific-gravity.html/feed 0