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R. Schultz Gems specializes in hand-cut, high quality Brazilian colored gemstones. Our loose gemstones are purchased directly at the mine sites in Brazil, thereby avoiding middlemen charges and guaranteeing the lowest costs possible. Frequent trips to the mining areas ensures an excellent selection and in-depth understanding of new gemstone finds and market trends as they occur. Add a little sparkle to your loose gemstone jewelry collection with some of our custom diamond jewelry. Or see what can be done with our colored gemstones by taking a look at our custom designed rings and slides. If you are having trouble deciding on which gemstone to purchase or if you have any questions, please contact us. We will be happy to assist you with your selection. Your complete satisfication is our goal. Customer service is what keeps our clients coming back again and again. |
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Amethyst |
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Ametrine |
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Aquamarine |
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- Crystal system: Trigonal
- Chemical composition: SiO2
- Color: Violet, purple pink.
- Hardness: 7.0
- Specific gravity: 2,65
- Refractive index: 1.54
- Dispersion: 0.013
- Pleochroism: Purple, reddish purple
- Birthstone: February
- Zodiac: Pisces
- Enhancements: Amethysts may be heated to lighten very dark purple crystals prior to cutting. The treatment is permanent, although only occasionally used.
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- Crystal system: Trigonal
- Chemical composition: SiO2
- Color: Violet / Yellow
- Hardness: 7.0
- Specific gravity: 2,65
- Refractive index: 1.54
- Dispersion: 0.013
- Enhancements: Ametrines may be heated to improve their color.
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- Crystal system: Hexagonal
- Chemical composition: Silicate of aluminium beryllium Al2 Be3 (Si6 O18)
- Color: Blue to blue-green
- Hardness: 7.5 - 8.0
- Specific gravity: 2,72 (+0,18 -0,05)
- Refractive index: 1,577 - 1,583
- Dispersion: 0.014
- Pleochroism: Light to medium (blue, sometimes blue and blue-green)
- Birthstone: March
- Zodiac: Scorpio
- Enhancements: Aquamarines may be heated to remove yellow components and produce a purer blue color. The treatment is permanent and is a common practice in the industry.
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Blue Topaz |
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Citrine |
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Precious Topaz |
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- Crystal System: Orthorhombic
- Chemical Composition: Fluosilicate of aluminum
- Color: Blue
- Hardness: 8
- Specific Gravity: 3.53 - 3.56
- Refractive Index: 1.610 - 1.620
- Dispersion: 0.014
- Pleochroism: Colorless, pale pink, blue
- Birthstone: December (alternate stone)
- Zodiac: Sagittarius
- Enhancements: Blue topaz is commonly produced by irradiating and then heating "white" topaz. The treatment is universal and permanent.
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- Crystal system: Trigonal
- Chemical composition: Silicon dioxide (SiO2)
- Color: Yellowish orange to brownish yellow
- Hardness: 7.0
- Specific gravity: 2,65
- Refractive index: 1,54-1.55
- Dispersion: 0.013
- Pleochroism: Yellow to light yellow
- Birthstone: November (alternate stone)
- Enhancements: Citrines may be heated to improve the color, and the treatment is permanent.
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- Crystal System: Orthorhombic
- Chemical Composition: Fluosilicate of aluminum
- Color: Peach-orange, yellow-orange
- Hardness: 8
- Specific Gravity: 3.53 - 3.57
- Refractive Index: 1.610 - 1.621
- Dispersion: 0.014
- Pleochroism: Honey yellow, pinkish yellow
- Birthstone: November
- Zodiac: Sagittarius
- Enhancements: Currently, there are no known enhancement procedures for Precious Topaz.
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Rhodolite Garnet |
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Rubellite |
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Tourmaline |
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- Crystal system: Cubic
- Chemical composition: (FeMg)3Al2Si3O12 Silicate of magnesium, iron and aluminium.
- Color: Brownish red, violet red.
- Hardness: 7.0 - 7.5
- Specific gravity: 3.6 - 4.2
- Refractive index: 1.73 - 1.83
- Dispersion: 0.024
- Pleochroism: None
- Birthstone: January
- Zodiac: Aquarius
- Enhancements: Currently, there are no known enhancement procedures for Rhodolite Garnet.
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- Crystal System: Trigonal
- Chemical Composition: Borosilicate complex
- Color: pink, red, reddish purple
- Hardness: 7.0 - 7.5
- Specific Gravity: 3.05
- Refractive Index: 1.62 - 1.64
- Dispersion: 0.017
- Pleochroism: pink, dark red
- Birthstone: October (alternate stone)
- Enhancements: Some red and pink tourmalines are occasionally heated to improve their color.
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- Crystal system: Trigonal
- Chemical composition: Borosilicate complex
- Color: Green
- Hardness: 7.0 - 7.5
- Specific gravity: 3.06
- Refractive index: 1.62 - 1.64
- Dispersion: 0.017
- Pleochroism: pale green, dark green
- Enhancements: Some very dark green and dark blue green tourmalines are heated to lighten their colors. The treatment is permanent and only occasionally performed.
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