Spinel

Spinel

Hardness
8
Refractive index
1,718 à 1,730
Specific gravity
3,61 to 3,67

Nomenclature

Shape

Indicative weight

– carats

Dimensions (mm)Weight (ct)

A calibrated series, to scale

All shapes side by side
Round
Dimensions (mm)Weight (ct)
2.00.03
2.50.07
3.00.12
3.50.22
4.00.31
4.50.40
5.00.56
5.50.77
6.00.98
7.01.40
Oval
Dimensions (mm)Weight (ct)
4 × 30.20
5 × 30.28
6 × 40.53
7 × 50.82
8 × 61.33
9 × 72.01
10 × 82.66
11 × 94.03
12 × 105.22
14 × 106.52
Marquise
Dimensions (mm)Weight (ct)
4 × 20.10
5 × 2.50.15
6 × 30.28
8 × 40.63
10 × 51.12
12 × 61.99
15 × 74.40
16 × 85.24
18 × 97.84
20 × 1010.64
Heart
Dimensions (mm)Weight (ct)
3.00.17
4.00.39
4.50.50
5.00.61
5.50.86
6.01.17
7.01.48
8.01.89
9.02.59
10.03.97
Octagon
Dimensions (mm)Weight (ct)
4 × 30.24
5 × 30.31
6 × 40.63
7 × 51.17
8 × 61.76
9 × 72.46
10 × 84.02
11 × 95.21
12 × 107.33
14 × 107.70
Pear
Dimensions (mm)Weight (ct)
5 × 30.24
6 × 40.43
7 × 50.77
8 × 51.17
9 × 61.87
10 × 72.53
12 × 83.50
14 × 95.72
15 × 106.10
16 × 1210.22
Square
Dimensions (mm)Weight (ct)
2.00.07
2.50.11
3.00.18
3.50.35
4.00.42
4.50.70
5.00.82
5.51.00
6.01.26
7.02.04

Sources

Spinel's major deposits are in Sri Lanka, Myanmar, Tanzanie and Pakistan.

Common treatments

Spinels are rarely treated.

Care and cleaning

Spinel has an excellent durability.

However, ultrasound and steam jets should be used very carefully.

Clean with warm soapy water and dry with a soft cloth.