| Quartz is the most common mineral on the face of | | | | very durable gemstone suited for everyday wear. |
| the Earth. Chemically, quartz is a compound called | | | | Ametrine, Quartz, Natural ametrine is not usually |
| silicon dioxide, SiO2. As a crystal, quartz is used as a | | | | enhanced; amethyst can be heated to produce |
| semiprecious gemstone. Quartz is a relatively hard | | | | ametrine. |
| stone, 7 on the Mohs hardness scale. | | | | Citrine is a macrocrystalline variety of the mineral |
| Quartz is one of the most abundant mineral crystals | | | | Quartz (SiO2). Sometimes you will hear citrine referred |
| and can take many forms. Quartz is a piezoelectric | | | | to as topaz quartz, which is incorrect. Citrine includes |
| material that moves when placed in an electric field. It | | | | yellow to gold to orange brown shades of transparent |
| has been applied in various devices as an oscillator. | | | | quartz. Citrine crystals can form together with |
| Quartz is used extensively in industry and was used in | | | | amethyst or smoky quartz to form ametrine and |
| radios and most of all it had its impact in the watch | | | | bi-colored quartz. Most commercial citrine is in fact |
| industry. It is very resistant to chemical weathering. A | | | | artificially heated amethyst or smoky quartz. Citrine |
| conchoidal fracture will result when quartz is struck | | | | crystals can form together with amethyst to form |
| and it has no cleavage. | | | | ametrine, or with smoky quartz to form bicolored |
| In pure form, quartz is colorless, but it is commonly | | | | quartz. One of the most durable gemstones, citrine |
| colored by impurities. Rose quartz is a pink stone often | | | | gets its name from the French for lemon, in honor of |
| worn as crystal pendants or bead necklaces. Green | | | | its vibrant yellow hue. The difference between citrine |
| quartz is sometimes referred to as aventurine quartz. | | | | and amethyst is only the Oxidation State of the iron |
| Milky quartz is a common mineral that is found in many | | | | impurities present in the quartz. Natural citrine is rarer |
| different types of rocks. Pink or peach colored quartz | | | | than amethyst or smoky quartz, both of which are |
| is called rose quartz. Smoky quartz is generally | | | | often heated to change their natural color to that of |
| transparent to translucent quartz that is gray to black | | | | citrine. Synthetic Russian citrine is produced directly by |
| in color. The most common and familiar inclusion in | | | | the addition of iron to the growth solutions. Natural |
| quartz is rutile. Rutilated Quartz is a variety of Quartz | | | | citrine is one of the rarer varieties of quartz. However, |
| crystal that contains small needles of Rutile trapped | | | | heating poor quality amethyst generally artificially forms |
| inside. | | | | the darker citrine. Citrine, a form of quartz, is used or |
| Amethyst is the purple variety of quartz and is a | | | | worn to remove fear, to prevent nightmares and to |
| popular gemstone. Amethyst is the most highly valued | | | | ensure a good nights sleep. |
| stone in the quartz group. Amethyst displays shades | | | | Tiger's eye quartz contains brown iron, which |
| of violet due to the presence of small amounts of | | | | produces its golden yellow color. Tiger's eye (tiger's |
| Fe3+ ions. Amethyst is sometimes heat treated to | | | | eye, tiger-eye, and tiger iron) is a member of the |
| form citrine. On exposure to heat, amethyst generally | | | | quartz group of chalcedonies. This changeable luster |
| becomes yellow, and much of the cairngorm or yellow | | | | and rich brown to golden color makes tiger's eye |
| quartz of jewelry is said to be merely "burnt amethyst. | | | | jewelry striking and desirable. Tiger's Eye - Yellow |
| Ametrine occurs naturally and is the combination of | | | | brown or blue fibrous material that forms by the |
| amethyst and citrine in the same crystal. Ametrine is a | | | | replacement of riebeckite by quartz. The unique |
| variety of quartz that contains both amethyst and | | | | appearance of tiger's eye is caused by fibrous |
| citrine sectors in the same crystal. Ametrine is a real | | | | inclusions. Tiger's Eye is a brown quartz silicon dioxide |
| gemstone variety mostly found in Bolivia. Ametrine is a | | | | with lustrous yellow and brown parallel fibers. |