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Almandine garnet

Hardness: 7.5
Refractive index: 1.76 to 1.81
Specific gravity: 3.80 to 4.20

Nomenclature

Shape

Indicative weight

– carats


Dimensions (mm)	Weight (ct)

A calibrated series, to scale

All shapes side by side

Round
Dimensions (mm)	Weight (ct)
2.00	0.03
2.50	0.07
3.00	0.12
3.50	0.22
4.00	0.31
4.50	0.40
5.00	0.56
5.50	0.77
6.00	0.98
7.00	1.40

Oval
Dimensions (mm)	Weight (ct)
4 × 3	0.20
5 × 3	0.28
6 × 4	0.53
7 × 5	0.82
8 × 6	1.33
9 × 7	2.01
10 × 8	2.66
11 × 9	4.03
12 × 10	5.22
14 × 10	6.52

Marquise
Dimensions (mm)	Weight (ct)
4 × 2	0.10
5 × 2.5	0.15
6 × 3	0.28
8 × 4	0.63
10 × 5	1.12
12 × 6	1.99
15 × 7	4.40
16 × 8	5.24
18 × 9	7.84
20 × 10	10.64

Heart
Dimensions (mm)	Weight (ct)
3.00	0.17
4.00	0.39
4.50	0.5
5.00	0.61
5.50	0.86
6.00	1.17
7.00	1.48
8.00	1.89
9.00	2.59
10.00	3.97

Octagon
Dimensions (mm)	Weight (ct)
4 × 3	0.24
5 × 3	0.31
6 × 4	0.63
7 × 5	1.17
8 × 6	1.76
9 × 7	2.46
10 × 8	4.02
11 × 9	5.21
12 × 10	7.33
14 × 10	7.70

Pear
Dimensions (mm)	Weight (ct)
5 × 3	0.24
6 × 4	0.43
7 × 5	0.77
8 × 5	1.17
9 × 6	1.87
10 × 7	2.53
12 × 8	3.50
14 × 9	5.72
15 × 10	6.10
16 × 12	10.22

Square
Dimensions (mm)	Weight (ct)
2.00	0.07
2.50	0.11
3.00	0.18
3.50	0.35
4.00	0.42
4.50	0.70
5.00	0.82
5.50	1.00
6.00	1.26
7.00	2.04

Sources

Almandine can be found in Brazil, India, Madagascar,

Sri Lanka, Tanzania, Zambia and in the United States.

Common treatments

Garnet's medium hardness makes this stone fairly easy to scratch.

In order to protect a garnet from abrasion, the usual precautions apply.

Care and cleaning

Keep the almandine away from heat, thermal shocks, ultrasound and blowtorch as it might cause cracks.