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2. House of Amber - Wikipedia

   en.wikipedia.org/wiki/House_of_Amber

   1962 - Einar Fehrn's son, Søren Fehrn entered the company where he began grinding and polishing amber pieces. 1965 - House of Amber opened its first workshop with one employee; 1980s- The company began focusing on refining the production of amber jewelry. 1988 - House of Amber opened a branch in Gdansk, Poland with 16 employees.

3. Cardinal gem - Wikipedia

   en.wikipedia.org/wiki/Cardinal_gem

   The five cardinal gems. Clockwise from top: sapphire, ruby, emerald, amethyst, diamond. Cardinal gems are gemstones which have traditionally been considered precious above all others.

4. Gemstone - Wikipedia

   en.wikipedia.org/wiki/Gemstone

   Group of precious and semiprecious stones—both uncut and faceted—including (clockwise from top left) diamond, uncut synthetic sapphire, ruby, uncut emerald, and amethyst crystal cluster.

5. List of U.S. state minerals, rocks, stones and gemstones

   en.wikipedia.org/wiki/List_of_U.S._state...

   Leaders of states in the U.S. which have significant mineral deposits often create a state mineral, rock, stone or gemstone to promote interest in their natural resources, history, tourism, etc.

6. List of gemstones by species - Wikipedia

   en.wikipedia.org/wiki/List_of_gemstones_by_species

   Actinolite. Nephrite (var.); Adamite; Aegirine; Afghanite; Agrellite; Algodonite; Alunite; Amblygonite; Analcime; Anatase; Andalusite. Chiastolite; Andesine ...

7. Topaz - Wikipedia

   en.wikipedia.org/wiki/Topaz

   Topaz is a silicate mineral made of aluminum and fluorine with the chemical formula Al 2 Si O 4 (F, OH) 2.It is used as a gemstone in jewelry and other adornments. Common topaz in its natural state is colorless, though trace element impurities can make it pale blue or golden brown to yellow-orange. [7]