Exodus 28:9 says, And thou shalt take two onyx stones, and grave on them the names of the children of Israel:  There were to be two oryx stones engraved with the names of the children, or tribes, of Israel.  Verse ten adds, Six of their names on one stone, and the other six names of the rest on the other stone, according to their birth.  Six were to be named on one stone and six on the other, according to birth order.  Verse eleven says, With the work of an engraver in stone, like the engravings of a signet, shalt thou engrave the two stones with the names of the children of Israel: thou shalt make them to be set in ouches of gold.  These were to be precious stones, which would represent all the people of Israel appearing before God when the High Priest went in to the holy of holies.  Christ represents each believer by name before God today, and we should realize what a precious thing this is.  Verse twelve states, And thou shalt put the two stones upon the shoulders of the ephod for stones of memorial unto the children of Israel: and Aaron shall bear their names before the LORD upon his two shoulders for a memorial.  Aaron was to bear the two stones, representing all God's people, on his shoulders, just as Christ bears all of those who believe in and follow Him upon His shoulders today.  Verse thirteen says, And thou shalt make ouches of gold;  Verse fourteen adds, And two chains of pure gold at the ends; of wreathen work shalt thou make them, and fasten the wreathen chains to the ouches. This was to be a very precious and ornate garment, much more so than the ordinary priestly garments.  Verse fifteen says, And thou shalt make the breastplate of judgment with cunning work; after the work of the ephod thou shalt make it; of gold, of blue, and of purple, and of scarlet, and of fine twined linen, shalt thou make it.  There was to be a breast plate of judgment made, in the same manner as the ephod.  Verse sixteen states,  Foursquare it shall be being doubled; a span shall be the length thereof, and a span shall be the breadth thereof.  The breast plate was to be of double thickness, or two ply.  These next few verse give details of the breast plate.  Verse seventeen says,  And thou shalt set in it settings of stones, even four rows of stones: the first row shall be a sardius, a topaz, and a carbuncle: this shall be the first row. Verse eighteen states, And the second row shall be an emerald, a sapphire, and a diamond.  Verse nineteen adds, And the third row a ligure, an agate, and an amethyst. Verse twenty continues, And the fourth row a beryl, and an onyx, and a jasper: they shall be set in gold in their inclosings.   Verse twenty-one concludes, And the stones shall be with the names of the children of Israel, twelve, according to their names, like the engravings of a signet; every one with his name shall they be according to the twelve tribes.  There were to be a total of twelve different stones, each with the name of one of the tribes of Israel on it.  Though we are all different, like these stones representing the people, we are all equally precious to God, and today Jesus is the One and only One Who can represent us before God.  He is our High Priest.  Verse twenty-two says, And thou shalt make upon the breastplate chains at the ends of wreathen work of pure gold.  This is simply more of the way the breast plate was to be made ornate.