English 
French 
German TOURMALINE
(Indicolite) 12.7 CARATS
Hardness: 7 – 7 ½
IR : 1.62 – 1.65
Birefringence: 0.014 – 0.021
Density: 3.0 – 3.1 <
Stability: Very good
Origin: XXX
OUR GEMS COLLECTION
AMETHYST
7.4 CARATS
Hardness: 7
IR : 1.54 – 1.56
Birefringence: 0.009
Density: 2.65
Stability: Good
Origin : Bolivia
WELO OPAL
4.3 CARATS
Hardness: 6
IR : 1.40 – 1.46
Birefringence: none
Density: 2.00 – 2.10
Stability: Medium
Origin : Ethiopia
IMPERIAL TOPAZ
2.7 CARATS
Hardness: 8
IR : 1.61 – 1.64
Birefringence: 0.008 – 0.010
Density: 3.5 – 3.6
Stability: Good
Origin: Brazil
EMERALD
2.6 CARATS
Hardness: 7 ½
IR : 1.57 – 1.60
Birefringence: 0.006 – 0.008
Density: 2.65 – 2.80
Stability: Medium
Origin : Zambia
SPINEL
4.1 CARATS
Hardness: 8
IR : 1.72 – 1.73
Birefringence: None
Density: 3.61 – 3.67
Stability: Very good
Origin: Tanzania
DIAMOND
1.4 CARATS
Hardness: 10
IR : 2.42
Birefringence: none
Density: 3.52
Stability: Excellent
Color D, Purity VVS1
Aigue-marine
7.2 CARATS
Hardness: 7 ½
IR : 1.56 – 1.60
Birefringence: 0.003 – 0.010
Density: 2.65 – 2.80
Stability: Good
Origin : Madagascar
TANZANITE
5.5 CARATS
Hardness: 6½
IR : 1.69 – 1.70
Birefringence: 0.006 – 0.013
Density: 3.15 – 3.38
Stability: Good
Origin: Tanzania
GARNET
5.2 CARATS
Hardness: 6½ – 7 ½
IR : 1.70 – 1.89
Birefringence: none
Density: 3.30 – 4.20
Stability: Good
Origin: Malawi
RUBIN
2.1 CARATS
Hardness: 9
IR : 1.76 – 1.78
Birefringence: 0.008 – 0.009
Density: 3.80 – 4.05
Stability: Very good
Origin : Mozambique
SAPPHIRE
3.5 CARATS
Hardness: 9
IR : 1.76 – 1.78
Birefringence: 0.008 – 0.009
Density: 3.80 – 4.05
Stability: Very good
Origin: Sri Lanka
