SILLIMANITE GEMSTONES

Sillimanite, Al2SiO5, Aluminum Silicate, is a polymorph with two other minerals, kyanite and andalusite.  A polymorph is a mineral that shares the same chemistry but a different crystal structure with another, or other, minerals. Sillimanites crystal system is orthorhombic. Sillimanite is a rare gemstone that is not frequently seen in faceted form.  The crystals are found in shades of brown, white and green.  Generally, only the rare, prismatic transparent crystals are cut as gemstones.  The refractive index is 1.654-1.683.  Sillimanite gemstones have a hardness of 7.5 on the mohs scale, making Sillimanite gemstones very wearable in jewelry. We have the following loose sillimanite gemstones in stock.

 
LOT#
 Size
Shape
 Color/Grade
 Carat Wt.
 Price per ct.
 Lot Price
701    
9x7.3mm
 Oval
 Clear AA
 1.65 cts.
 $32.00
 $52.80
702 (PIC)
 11x7mm
 Emerald Cut
 Clear A+
 1.80 cts.
 20.00
 $36.00
703 (PIC)
 8.8x6.1mm
 Oval
 Clear A+
 1.29 cts.
 $22.00
 $28.38
704 (PIC)
 10.6x8.5mm
 Oval
 Clear A
 2.50 cts.
 $18.00
 $45.00
705    
12.8x9.8mm
 Emerald Cut
 Clear A+
 6.00 cts.
 $20.00
 $120.00
706 (PIC)
 13.4x10.9mm
 Oval
 Clear AAA
 4.80 cts.
 $38.00
 $182.40
707 (PIC)
 8.7x6.8mm
 Emerald Cut
 Clear AAA
 2.20 cts.
 $38.00
 $83.60
708 (PIC)
 8.8x7.2mm
 Oval
 Clear A+
 1.70 cts.
 $20.00
 $34.00
709    
8.5x7.0mm
 Oval
 Clear AA
1.78 cts.
 $32.00
 $56.96
710 (PIC)
 11x9mm
 Oval
 Clear A-
 3.05 cts.
 $16.00
 $48.80
711 (PIC)
 10.5x8.5mm
 Oval
 Clear AA
 2.85 cts.
 $32.00
 $91.20
712 (PIC)
 10.4x8.3mm
 Oval
 Clear AAA
 2.40 cts.
 $38.00
 $91.20 
713 (PIC)
 9.5x7.7mm
 Oval
 Clear AAA
 1.95 cts.
 $38.00
 $74.10
714    
11x8.5mm
 Oval
 Clear AA
 3.00 cts.
 $32.00
 $96.00
715 (PIC)
 8.7x7.4mm
 Oval
 Clear AAA
 2.15 cts.
 $38.00
 $81.70
716 (PIC)
 11.3x9mm
 Oval
 Clear A+
 3.20 cts.
 $20.00
 $64.00
717 (PIC)
 8.8x7.4mm
 Oval
 ClearAAA
 1.70 cts/
 $38.00
 $64.60
718   
10.3x8.1mm
 Oval
 ClearB+
 1.90 cts.
 $12.00
 $22.80

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