Reference: AML24F
Stone type: Natural Amethyst, Shape: Round, Color: Mauve, Weight carat: 0.20 - 0.30, Treatment: Untreated, Additional details: Stones colors doesn't match, Source: Brazil, Stone Clarity: Eye clean, Stone size mm: 3.70 - 4.20, Sale information: Price by piece
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Amethyst is a variety of violet-blue quartz. Amethyst is a very widespread mineral in nature, larger specimens that can be cut and polished are used as gemstones, such crystals have been found in Brazil, Uruguay, Madagascar, Russia, Germany and Sri Lanka. Such large crystals are found in geodes (voids) of hydrothermal vents associated with chalcedony and in volcanic rocks.
The mineral is frequently purple in color, varying in shades to shades of pink. The color is unevenly distributed in the mass of the mineral, so streaks of darker shades appear. Color determinants are made by the presence of Fe4+ ions placed in the atomic structure of the tetrahedral network. The color of amethyst is said to be due to the replacement of silicon atoms with iron atoms, this being a controversial theory. Amethysts can be transformed by exposure to radiation into colorless crystals. A similar effect of color change is achieved by exposing the mineral to the sun or heat for a longer time.
Amethyst is a prized gemstone, frequently being cut as a brilliant, shuttle or briolette. The dark purple variety is the most valuable, as is the ametrine variety a transitional state from amethyst to citrine. Manipulations by heating amethyst to 400 °C produce the yellow color of citrine, similarly heating can produce the green color of prasiolite, or perhaps colorless quartz, as well as the degradation of the crystal by cracking.
Data sheet
Stone type: Natural Amethyst, Shape: Round, Color: Mauve, Weight carat: 0.20 - 0.30, Treatment: Untreated, Additional details: Stones colors doesn't match, Source: Brazil, Stone Clarity: Eye clean, Stone size mm: 3.70 - 4.20, Sale information: Price by piece
Stone type: Natural Pink Quarz, Shape: Oval cabochon, Color: Light pink, Weight carat: 5.75, Treatment: Untreated, Source: Brazil, Stone Clarity: Eye clean, Stone size mm: 14.00x10.00 - 14.10x10.10, Sale information: Price by piece
Stone type: Natural Amethyst, Shape: Round, Color: Purple, Stone size mm: 4.90 - 6.10, Weight stone carat: 0.45 - 0.85, Stone Clarity: Eye clean,, Treatment: Untreated, Source: Zambia
Stone type: Natural Garnet, Shape: Cushion, Color: Red-burgundy, Weight carat: 2.80 - 4.20, Treatment: Untreated, Source: Mozambique, Stone Clarity: Eye clean, Stone size mm: 9.90x7.70 - 10.00x8.10, Sale information: Lot price
Stone type: Natural Amethyst, Shape: Emerald, Color: Mauve, Weight carat: 1.45, Treatment: Untreated, Source: Brazil, Stone Clarity: Eye clean, Stone size mm: 7.90x5.90 - 8.20x6.10, Sale information: Price by piece
Stone type: Natural Smoky Quartz, Shape: Round, Color: Brown, Weight carat: 0.65, Treatment: Heated, Source: Brazil, Stone Clarity: Eye clean, Stone size mm: 6.00 - 6.10, Sale information: Price by piece
Stone type: Natural Amethyst, Shape: Oval, Color: Mauve, Weight carat: 0.90, Treatment: Untreated, Source: Brazil, Stone Clarity: Eye clean, Stone size mm: 7.90x5.70 - 8.10x6.00, Sale information: Price by piece
Stone type: Natural Carnelian, Colour: Orange, Shape: Round, Stone size mm: 6.00 - 6.10, Weight carat: 0.90 - 1.20, Stone Clarity: Eye clean, Treatment: Heated, Source: India
Stone type: Natural Kyanite, Shape: Oval, Color: Blue, Weight carat: 0.15 - 0.25, Treatment: Untreated, Additional details: Uneven color, Additional details: Stones colors doesn't match, Source: Nepal, Stone Clarity: Slightly visible inclusions, Stone size mm: 3.90x3.00 - 4.20x3.20, Sale information: Price by piece
Stone type: Natural Citrine, Shape: Brilliant, Color: Yellow, Weight carat: 0.07, Treatment: Heated, Source: Brazil, Stone Clarity: Eye clean, Stone size mm: 3.00, Sale information: Price by piece
