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mallet
A hammer-shaped tool made of a material that will not seriously mar the metal, such as rubber, rawhide, or wood
mandrel ...
Mallet: A hammer with a heavy head made of non metallic material, used for cold forging operations on soft metals, to avoid denting the work as would be done by a steel hammer.
Mallet found that this was really due to a glaze of mica covering the basal cleavage planes which he thinks is caused by a partial alteration of the mineral, and pronounced them to be really sapphire.
A variation on this that avoids the possibility of marring a ring with mallet blows is the use of a tool called the Schwaan Ring Stretcher.
Native American mined turquoise in the Southwest with wooden mallets, and still create some of the most stunning pieces of silver and turquoise jewelry found anywhere.
Mallet of the Indian Museum first declared in the Manual of Geology of India after examining the stones, which had not been identified before, that they were in fact sapphires.
2) Cleaving and/or sawing: Although most of us can picture that tense moment when the "cleaver" swings his mallet and strikes the wedge that will separate a diamond along its cleavage plane, in reality, few diamonds are cleaved today.
Such an experiment was shown at the Material Vision Fair in Frankfurt in November 2005. Several panels were hit with a rubber mallet, and the panel with the piezo element immediately stopped swinging.
center punch - A steel punch that has a v-shaped tip used to mark a point on metal and for starting a hole for drilling. An automatic center punch is spring loaded thus marking the metal without the use of a hammer or mallet.
The cutter "cleaved" the rough stone into smaller stones that were close to the approximate final shape that was desired. Cleaving was accomplished by striking the stone in just the right spot with a chisel and mallet.
Those sulfides which are not opaque (cinnabar, realgar, and orpiment) are transparent only in very thin sections. Some species such as pyrite emit a sulfurous odor when they are struck with a mallet.
 See also: Shape, Color, Table, Make, Rough
  
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