People have always said “Prostitution is the oldest profession in the world” I beg to differ. Geology was in essence the oldest profession because God was our very 1stgeologist. He even transferred some of this knowledge to our forefathers and most used rocks to describe Him. “Yahweh is my rock, and my fortress” (2 Sam 22:2; Ps 18:2; 71:3) “God, the rock of my salvation” (2 Sam 22:47). The most used and mentioned precious stone in the bible is obviously gold. From smelting for their idols to donning it on garments and to making of chalices and chariots gold was used by the ruling elite to showcase their majestic nature.    The two Testaments have numerous examples of various Rock uses both precious and ordinary.
Our forefathers had garments to marvel at! Starting with the High priests they wore “Holy Garments” were full of precious stones 12 to be exact. Now these were robes but pieces of beauty all the same. Their breastplates were embodied with gold. It had 12 precious stones sadius (ruby), topaz, carbuncle (garnet), emerald, sapphire, diamond, jacinth, agate, amethyst, beryl, onyx, and jasper (Exodus 28:10-30). They were to signify the 12 tribes of Israel.
Later on in the testament Prophet Ezekiel gave the people a glimpse of our 1sthumans clothes to you who think they walked naked “you were in Eden, the garden of God; every precious stone was your covering: the sardius (ruby), topaz, and the diamond, the beryl, the onyx (agate), and the jasper, turquoise, and emeraldand the carbuncle, and gold:” notice that these were the same precious stones described in Exodus so the high priests were probably just carrying on tradition.
Jacob was more inventive in his uses of rocks, “How awesome is this place! This is none other than the house of God, and this is the gate of heaven.” So Jacob rose early in the morning, and he took the stone which he had put under his head and set it up for a pillar and poured oil on the top of it. He called the name of that place Bethel” (Genesis 28:17-19). Not only did he use is as a pillow but it was used to name a place. This is the same place where Jesus was anointed by a woman with very expensive perfume (Mark 14:3)
From the commandments to religious inscriptions the scribes of old used rocks for a more permanent preservation of writings. Recent research has been trying to prove that the 10 commandments were actually written on a blue rock: sapphire. Rocks were did not necessarily have glamorous uses but served the purpose all the same.
 “Say to the people of Israel, Any man of the people of Israel, or of the strangers that sojourn in Israel, who gives any of his children to Molech shall be put to death; the people of the land shall stone him with stones.” (Leviticus 20:1-2)
“When the House was built, it was with stone prepared at the quarry; so that neither hammer nor axe nor any tool of iron was heard in the Temple, while it was being built.” (1 Kings 6:7)
But in my opinion Job takes Geologist of the Old Testament for this chapter
  “Surely there is a mine for silver, and a place where gold is refined. Iron is taken from the earth, and copper is smelted from the ore. “Man puts an end to darkness, and searches every recess for ore in the darkness and shadow of death.  He breaks open a shaft away from people; in places forgotten by feet they hang far away from men; they swing to and fro. As for the earth, from it comes bread, but underneath it is turned up as by fire; Its stones are the source of sapphires, and it contains gold dust. That path no bird knows, nor has the falcon’s eye seen it. The proud lions have not trodden it, nor has the fierce lion passed over it. He puts his hand on the flint; he overturns the mountains at the roots. He cuts out channels in the rocks, and his eye sees every precious thing. He dams up streams from trickling; what is hidden he brings forth to light. But where can wisdom be found? And where is the place of understanding?  Man does not know its value nor is it found in the land of the living. The deep says ‘It is not in me’ and the sea says, ‘It is not in me.’ It cannot be purchased for gold nor can silver be weighed for its price. It cannot be valued in the gold of Ophir, in the precious onyx or sapphire. Neither gold nor crystal can equal it, nor can it be exchanged for jewellery of fine gold. No mention shall be made of coral or quartz, for the price of wisdom is above rubies. The topaz of Ethiopia cannot equal it, nor can it be valued in pure gold...” 
The B.C Christians used their rocks and stones to preserve their history in form of scriptures but the A.D Christians had even more ‘ingenious’ ways for them. Here there wasn’t much talk about the precious rocks. Here the stones generation started to appear.
Most recognisable was as tomb and of course the most famous tomb of all the tomb of Joseph of Arimathea, the tomb in which Jesus was buried in.
“When it was evening, there came a rich man from Arimathea, named Joseph, who also was a disciple of Jesus. He went to Pilate and asked for the body of Jesus. Then Pilate ordered it to be given to him. And Joseph took the body, and wrapped it in a clean linen shroud, and laid it in his own new tomb, which he had hewn in the rock; and he rolled a great stone to the door of the tomb, and departed.” 
Before all that Judas betrayed Jesus with 30 pieces of silver “when Judas who had betrayed him, saw that Jesus was condemned he was seized with remorse and returned the thirty silver coins to the Chief priests and the elders  “I have sinned ” he said “for I have betrayed innocent blood” (Mathew 27: 3-4).
Stoning was still being used in the new testament as in the old as a method of putting sinners to death with Jesus saving the woman who was caught in adultery from stoning John 8:7 as they stood there asking him questions he straightened himself up and said to them “whichever one of you who has committed no sin may throw the first stone at her” and in some of his parables too he used silver coins as an example Luke 15: 8-10 The Parable of the Lost Coin. 
Finally but not the least we all want to know how heaven will be well the last book in the bible gives us a very good mental picture
The construction of its wall was of jasper: and the city was pure gold like clear glass. The foundations of the wall of the city were adorned with all kinds of precious stones: The first foundation was jasper, the second sapphire, the third chalcedony, the fourth emerald, the fifth sardonyx, the sixth sardius (ruby), the seventh chrysolyte (peridote), the eighth beryl, the ninth topaz, the tenth chrysoprasus (quartz), the eleventh jacinth, and the twelfth amethyst . (Revelation 21:18 – 20)  So in short we will possibly still be geologists in heaven too.