Definitions, Word Origins
"concrete, cement, metal, precious"

cement
Gage Canadian Dictionary
noun
1. a fine grey powder made by burning clay and limestone.
2. this substance mixed with water and sand, gravel, or crushed stone to form concrete...
3. any soft substance that hardens to make things stick together.
4. a substance used to fill cavities in teeth...
5. anything that joins together or unites.

Dictionary of Word Origins, John Ayto, Arcade, New York, 1990

Cement: Latin caementa meant 'stone chips used for making mortar'; etymologically, the notion behind it was originally *caedmenta, a derivative of caedere 'cut' (from which English gets concise and decide). In due course the signification of the Latin word passed from 'small broken stones' to 'powdered stone (used for mortar),' and it was in this sense that it passed via Old French ciment into English.

metal
Gage Canadian Dictionary
noun
1. a substance that is usually shiny, a good conductor of heat and electricity, and can be made into wire, or hammered into sheets. Gold, silver, iron, copper, lead, tin or aluminum are metals.
2. an alloy or mixture of these such as steel or brass.
3. (adj.) made of metal or a mixture of metals.
...
7. material; substance.
Concise English Dictionary
noun
1. One of a class of elementary substances which usu. present in various degrees certain physical characters as lustre, maleability, and ductility....
2. a compound of the elementary metals, an alloy.

Dictionary of Word Origins, John Ayto, Arcade, New York, 1990

Metal: Greek metallon, a word of unknown origin, has a range of meanings, including 'mine' (the original sense) and 'mineral' as well as 'metal.' These were carried over into Latin metallum, but by the time the word reached English, via Old French metal, 'metal' was all that was left. Mettle is a variant spelling of metal, used to distinguish its metaphorical senses.
Closely related to medal, which etymologically means 'something made of metal.'

precious
Gage Canadian Dictionary
adj.
1. worth much; valuable. Gold , platinum and silver are often called the precious metals.
2. much loved; dear.
3. too nice; overrefined; affected.
4. (Informal) very great; thoroughgoing: a precious mess.
5. of great moral or spiritual worth.
adv.
Informal. very: precious little money
precious metal: a valuable metal such as gold, silver, or platinum.
precious stone: a jewel; gem. Diamonds, rubies, and sapphires are precious stones.

Webster's New World Dictionary
adj.
1. of great price or value; costly.
2. of great desirability; held in high esteem: as freedom is precious.
3. beloved; dear.
4. very fastidious, overrefined, or affected as in behaviour, language, etc.
5. egregious, arrant.
6. (Colloq.) very great: as a precious liar.

Dictionary of Word Origins, John Ayto, Arcade, New York, 1990

Precious: Latin pretiosus 'expensive, valuable, precious' was derived from pretium 'price' (source of English praise, price and prize). English acquired it via Old French precios. The sense 'affected' was introduced from French in the early 18th century.