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Average weight for faceted gems
   Size & Weight
(mm) Oval 
(carats) Sapphire
(carats) Emerald
(carats) Ruby
 OTHER FACETED GEMS !
5x3 0.29 0.20 0.29
6x4 0.59 0.40 0.59  
7x5 1.06 0.66 1.06
8x6 1.65 1.13 1.65
9x7 2.36 1.60 2.36
10x8 3.50 2.40 3.50
11x9 4.90 3.40 4.90
12x10 6.80 4.10 6.80
(mm) Round 
(carats) Sapphire
(carats) Emerald
(carats) Ruby 
Why Shop With GGGems ?
2.0 0.04 0.03 0.04
2.5 0.08 0.06 0.08   12-Days Inspection Period
3.0 0.15 0.10 0.15   Gemological Authenticity
3.5 0.22 0.15 0.22   No Risk Payment
4.0 0.34 0.22 0.34   No Risk Return Policy
4.5 0.45 0.32 0.45   Swiss Owned
5.0 0.66 0.45 0.66   24 Hour E-mail Response
5.5 0.83 0.57 0.83   Secure Insured Delivery
6.0 1.09 0.72 1.09   Customer Commitment
6.5 1.36 0.95 1.36   Qualified Gemologists
7.0 1.64 1.10 1.64   English Support by e-mail
7.5 2.12 1.40 2.12
8.0 2.50 1.75 2.50
(mm) Square 
(carats) Sapphire
(carats) Emerald
(carats) Ruby 
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2x2 0.06 0.04 0.06  
3x3 0.22 0.12 0.22
4x4 0.56 0.28 0.56
5x5 0.80 0.50 0.80
(mm)Octagon 
(carats) Sapphire
(carats) Emerald
(carats) Ruby 
Conversion rate
5x3 0.35 0.25 0.35   
6x4 0.70 0.48 0.70 1 millimeter (mm) =  
7x5 1.30 0.87 1.30 0.0393700787 inch (in)
8x6 2.00 1.35 2.00   
9x7 3.10 2.16 3.10 1 inch (in)  = 
10x8 4.40 3.00 4.40 25.4 millimeters (mm)
11x9 6.18 4.00 6.18
12x10 8.30 5.10 8.30 Inches Calculator
(mm)Marquise
(carats) Sapphire
(carats) Emerald
(carats) Ruby 
 
4x2 0.12 0.08 0.12
4.5x2.5 0.15 0.10 0.15
5x2.5 0.20 0.12 0.20
5x3 0.24 0.16 0.24
6x3 0.29 0.21 0.29
7x3.5 0.45 0.32 0.45    
8x4 0.75 0.50 0.75
9x4.5 1.00 0.65 1.00
10x5 1.30 0.95 1.30
12x6 2.06 1.50 2.06
                                            
  Faceted colored gems Size & Weight
MADAGASCAR GEM SAFARI  MADAGASCAR SAPPHIRE  PAKISTAN SAFARI
Gemology
Cutting Styles
  Fancy styles
  Characteristics
 Crystalline Systems
Amethyst data
  Corundum Data
  Garnet Data
  Tourmaline Data
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