Egyptian amulets were usually small carved crystals of deities  (who would protect from a particular ailment or condition) or (afflicted) parts  of the 
body (such as hand, eye, foot, etc.). This principle of sympathetic  magick can 
be seen in early Europe through Celtic times right up until recently,  with votive offerings (though usually wood, stone or metal) of afflicted body  parts being thrown into rivers, lakes and holy wells and springs. Other early  cultures contemporary with the Egyptians also used amulets and talismans, so  fine examples may be found amongst, e.g., the Sumerians, early Chinese culture,  etc., and as time went by, the Greeks and Romans and other cultures continued  
this usage and maintained the tradition of crystal and mineral amulets and  talismans.
 
Amulets have a long tradition of usage by seafaring peoples, to  provide protection from the fury that could be faced at sea. Many amulets and  stones were used for this purpose (especially aquamarine, beryl and coral), and  a Greek 
lapidary from 3rd to 4th century CE details seven amulets to be made for  differing forms of protection. 
  
 The number seven might suggest the amulets were  
each used for a specific day of the week, though each amulet did provide a  specialized form of protection.
  
  The amulets were thus: 
 
1. A carbuncle (garnet) and a chalcedony -- to protect sailors  from drowning.
2. Quartz or corundum -- to protect from extreme  weather.
3. Aquamarine - to banish fear.
4. Agate - to protect against the  evil eye.
5. Coral, placed in strips of sealskin attached to the prow -- to  protect 
the ship from winds and waves.
6. Banded agate -- to protect from the  surging waves of the ocean.
7. Jet - providing major protection for any  traveling by river or sea.
  
 
The Christian Church decided at an early date to declare its  opposition to the use of amulets. At the Council of Laodicea in 355 CE Canon 34  decreed
"Priests and clerks must be neither enchanters, mathematicians, nor  astrologers, and that they must not make what are called amulets for these are  fetters of the soul, and all who wear them shall be cast out of the church." As  the 
centuries passed this canon was used or ignored as was convenient by those  in power in the church, as is witnessed by the talismanic use of gems by the  rich and powerful, and indeed the use by the church of differing gems to depict rank and station. 
 
As man entered the Middle Ages, more and more crystal usage became  concerned with protection from ailments, particularly the plague. Many stones  were thought to protect from plague, the most striking example being the Abraxas  Sto
ne. These stones beautifully illustrate the thinking going into the talisman,being engraved on one side with the image of a deity (who is appealed to for assistance/protection) and on the other side with a magickal formula embodying the protective formula - Abracadabra being derived from the Chaldean phrase  meaning "to perish like the word", reduces to an "A" and perishes like the 
word,  so likewise by sympathetic magick any contagion or plague symptoms should 
also  perish. 
 
One of the most common themes found in Middle Eastern charms is  protection from snake bites and scorpion stings, a fact of daily life in many  countries.
 
Thabit Ibn Qurra (836 - 901 CE) recorded details of an interesting  charm to rid a dwelling of scorpions. First an image of a scorpion was made out  of either copper, tin, lead, silver or gold whilst Scorpio was in the ascendant  in 
the heavens, and the glyph of Scorpio (Z) and appropriate astrological  information engraved on the image. 
  
 The scorpion charm was then buried under the  place afflicted by scorpions, whilst reciting "This is the burial of it and its  species, that it may not come to that one and to that place." It was considered more effective to make four charms and repeat this ritual, burying them at 
the  four corners of the dwelling. This is a lovely example of sympathetic magick,  using the image of the creature to be protected against, and the most 
propitious  astrological times, to ensure success in the desired spell. 
 
Protective charms are still in use in some parts of the world  today, particularly the Mediterranean and the Middle East. Red coral charms  shaped like a crescent moon, representing the protective hand gesture of index  and little finger raised are still given to babies and worn through life as a  protection against the "evil eye."
  
  Agate eye stones have been used in this  manner for many centuries and their use continues still. 
In India crystals were most prized in combination in amulets.
  
  The  two famous amulets are the five gem Pancharatna, comprising amethyst, diamond,  emerald, gold and pearl; and the nine gem Navaratna, comprising amethyst, cat's  eye, 
coral, diamond, emerald, pearl, ruby, sapphire and topaz. 
 
Crystals can be found to suit any attribution you may require for  a talisman, and are easy to charge and carry indeed simply carrying a crystal  and 
playing with it while you are doing things will help it build up charge and  also 
focus your unconscious mind on the energy of the talisman and help move you accordingly.
  
Shapes which work particularly well for protection are the sphere  and egg. 
 
When casting a magick "circle" you are really casting a sphere,  representing the universe, with you as the center of the sphere (and of course  we are all the center of our own universe, so don't feel this is presumptuous).
  
   Having a sphere as your focus can enable you to perceive the balance and  uniformity of 
the sphere and the energies in it, and engender a more protective  atmosphere about you. The egg also tends to produce a very protective feeling,  
corresponding as it also does to the universe (as in many creation myths where  the 
universe is formed from an egg), and to the spirit tatva (tatvas are  elemental symbols representing the elements), particularly if the egg is black  or purple as the spirit tatva is colored. Visualizing yourself in the center of  the sphere or egg, with the sphere/egg being the center of the sphere you have  created can also produce a "double glazed" effect, increasing the protection  
around you.
 
Cut crystals were also used in the past as a badge of rank, though  this may well have been due to the crystals being thought to be imbued with  magickal 
properties, as with the lapis lazuli feather of Mayat (representing  truth) worn by Egyptian judges set in gold and worn on a heavy gold chain.
 
Amber is a very good general storer of charge and jet is hard to  beat as a protective absorption talisman (though it needs regular cleaning, of  course), which may explain the witches' traditional amber and jet necklace. 
  These were also sometimes interspersed with bones, such as snake spine bones.  The reasons for this are not clear, but there are a number of possibilities, such as passing on the enduring qualities of bone, drawing on qualities of the  snake such as wisdom, regeneration, etc.
 
As can be seen from all these examples, crystals have a long  history of use to attract qualities or to protect from events, so why not spend  a bit more time meditating with one of your crystals, and see what comes up? 
Beannachd Bhrighide leat,  Rev. Ramoth