Dendritic Limestone, 20.15 ctw

Natural, uncut face (top) displaying delicate branching manganese oxide crystals called dendrites. Flat, semi-satin back with beveled edge for ease of setting. Item pictured is the item you will receive.

• Take extreme care when setting; limestone is a calcite based rock and may crack under too much pressure. Use several passes of even pressure when setting.
• Avoid surface of stone when polishing setting.  Do not place stone in a tumbler.  Dendrites are an extremely thin layer on the stone’s surface.
• Avoid pickle and any harsh chemicals.  Limestone will dissolve in any acid. 

Weight: 20.15 carats total weight
20.98 L x 11.96 W x 5.40 H mm
20.83 L x 10.25 W x 4.00 H mm

Type: rock; limestone with manganese oxide 
Trade Name(s): Dendritic Limestone, Dendritic Flagstone, Dendritic Jasper*
Origin: Utah, USA 
Enhancement(s): (N) Natural

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* Using the term "jasper" to describe this material is deceptive and a punishable crime under US Federal Trade Commission regulations.  Limestone is a calcite based sedimentary rock.  Jasper is an opaque form of cryptocrystalline quartz known as chalcedony.
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American Gem Trade Association Gemstone Enhancement Codes

Enhancement: Any treatment process other than cutting and polishing that improves the appearance (color/clarity/phenomena), durability, or availability of a gemstone.

(N) Natural
No modification; natural stones which are not currently known to be enhanced (or currently has no known modification process).