Greyish Blue Spinel Gemstone. Rectangle Cut. 1.30 ct.
$164.00
Greyish Blue Spinel Gemstone. Rectangle Cut. 1.30 ct. Beautiful spinel with a nick in the girdle.
WEIGHT : 1.30 ct
SIZE : 6.31 * 5.85 * 3.80 mm
SHAPE : Rectangle
COLOR : 22. (B) Blue
TONE : 5. Medium
SATURATION : 3. Very Slightly Brownish / Grayish
CLARITY GRADE : Moderate
CUT GRADE : Good
TREATMENT : Not evidence of heat
HARDNESS : 8
Inclusions type : Healed fracture, nick in the girdle.
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We can find Spinel Gemstones in a wide variety of colors: Red, Pink, Orange (”Flame” Spinels), Blue, Purple, Violet, Mauve, Grey, Green, Light Metallic Grey, almost Colorless, Black, sometimes can occur Asterism (4 or 6 rays), Change Color and Cat’s eye phenomenon.
Red - colored by Cr
Pink - colored by Cr
Blue - colored by Fe
Cobalt Blue - intense blue, colored by Co + Fe
Purple to Violet - colored by Cr + Fe
Orange - colored by Cr + Fe
Black (Ceylonite) - colored by Fe
THE MOST EXPENSIVE color varieties are vivid Red Spinel, vivid Pink Spinel, followed by Cobalt Blue Spinel (Sri Lanka), Flame Spinel (orange). Light colors, not so intense, are less valued.
CUT & SIZES
Spinel Gemstone is often cut into cushion shapes because of its octahedron crystalline habit. Oval, rounds and emerald shapes are very frequent. Some spinels are a perfect octahedra, in Burma is said to these spinels have been polished by the spirits, these pieces are mounted without cutting.
Spinel is cuted trying to maximize the weight retention of the rough.
Spinel is available in large sizes, but finest Red, Pink and Blue Spinels over 5 ct are rare and much appreciated.
CLARITY & INCLUSIONS
Red and Pink Spinels will show eye-visible inclusions, while generally are more cleaner than Ruby.
Typical inclusions: The main inclusions in Spinel Gemstones are healed fractures, solid inclusiones (apatite crystals are very common), boehmite tubes, fingerprinted (groups of Spinel octahedrons), octahedral negative crystals, fractures filled of iron oxides.
More information about Spinel Gemstone.
MdMaya Gems uses the following clarity scale when grading gemstones.
Setting aside translucent and opaque gemstones, the first classification to take into account is:
- Type 1: Stones that are often inclusion free
- Type 2: Stones that are usually included
- Type 3: Stones that are almost always included
CLARITY GRADES:
EYE CLEAN: Appears clean to the unaided eye. (Type 1, 2 and 3)
SLIGHTLY INCLUDED:
Type 1: Minute inclusions difficult to see with the unaided eye.
Type 2: Minor inclusions easy to see with the unaided eye.
Type 3: Noticeable inclusions apparent to the unaided eye.
MODERATELY INCLUDED:
Type 1: Minor inclusions somewhat easy to see with the unaided eye.
Type 2: Noticeable inclusions apparent to the unaided eye.
Type 3: Obvious inclusions very apparent to the unaided eye.
HEAVILY included: prominent inclusions that have a negative effect on appearance or durability.
SEVERELY INCLUDED: prominent inclusions that have a severe effect on appearance or durability or both. (Type 1, 2 and 3).
NOTE
All our gemstones have been analyzed by a qualified gemologist. Each precious stone comes with a gemological certificate to guarantee its authenticity, as well as describing its unique characteristics.
Pictures in this website might not reflect the intensity and brightness of the real color of the gemstone. Additionally, the pictures might not properly represent the real size of the gem (provided in millimeters). Do not hesitate in requesting more graphic documentation of the precious stone for any clarifications. This will be provided shortly to accommodate your needs.
The photographs of the inclusions, if any, are a distinctive sign NATURAL origin.
If you are interested in obtaining more information about this gemstone, CONTACT US and we will respond as son as possible.
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