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Black Opal Gemstone

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Size Guide
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Wonders of the earth, Opals are mystic. Explore how to use the color changing habit of opals in your life like a charm!

Depending on the color of opal you choose, its hidden powers including that of the chakra changes drastically. As a reference use violet= crown, indigo= third eye, blue= throat, pink/ green= heart, yellow= solar plexus, orange= sacral, red/black= base chakra.

Main Stone: Opal


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Ring Size Chart
AtPerry's uses US Ring Sizes.
Select a ring size in one category, the rest will change to match.
USA size Diam. inch. Diam. mm Circum. mm
British French German Japanese Swiss
Follow this Ring Size Chart to convert your Local Ring Size to USA Ring Size

International Ring Size Table

AtPerry's Size
(US / Canada)

UK / Australia / South Africa France Germany / Russia / Ukraine / Asia India / China / Japan / South America / Turkey / Israel Italy / Spain / Netherlands / Switzerland
½ A --- --- --- ---
1 B --- --- 1 ---
1 1/2 C --- --- --- ---
2 D 41 1/2 13 1/4 2 1 1/2
2 1/4 D-½ 42 1/8 13 1/2 --- ---
2 1/2 E 42 3/4 13 3/4 3 2 3/4
2 3/4 E-½ 43 3/8 --- --- 3 3/8
3 F 44 14 4 4
3 1/4 F-½ 44 5/8 14 1/4 ---

4 5/8

3 1/2 G 45 1/4 14 1/2 5 5 1/4
3 3/4 G-½ 45 7/8 14 3/4 6 5 7/8
4 H 46 1/2 15 7 6 1/2
4 1/4 H-½ 47 1/8 --- --- 7 1/8
4 1/2 I 47 3/4 15 1/4 8 7 3/4
4 3/4 J 48 3/8 15 1/2 --- 8 3/8
5 J-½ 49 15 3/4 9 9
5 1/4 K 49 5/8 16 --- 9 5/8
5 1/2 K-½ 50 1/4 16 1/4 10 10 1/4
5 3/4 L 50 7/8 --- 11 10 7/8
6 L-½ 51 1/2 16 1/2 12 11 1/2
6 1/4 M 52 1/8 16 3/4 --- 12 1/8
6 1/2 M-½ 52 3/4 17 13 12 3/4
6 3/4 N 53 3/8 --- --- 13 3/8
7 O 54 17 1/4 14 14
7 1/4 O-½ 54 5/8 17 1/2 --- 14 5/8
7 1/2 P 55 1/4 17 3/4 15 15 1/4
7 3/4 P-½ 55 7/8 18 --- 15 7/8
8 Q 56 1/2 --- 16 16 1/2
8 1/4 Q-½ 57 1/8 18 1/4 --- 17 1/8
8 1/2 R 57 3/4 18 1/2 17 17 3/4
8 3/4 R-½ 58 3/8 18 3/4 --- 18 3/8
9 S 59 19 18 19
9 1/4 S-½ 59 5/8 19 1/4 --- 19 5/8
9 1/2 --- 60 1/4 19 1/2 19 20 1/4
9 3/4 T 60 7/8 --- --- 20 7/8
10 T-½ 61 1/2 19 3/4 20 21 1/2
10 1/4 U 62 1/8 20 21 22 1/8
10 1/2 U-½ 62 3/4 --- 22 22 3/4
10 3/4 V 63 3/8 20 1/2 --- 23 3/8
11 V-½ 64 20 3/4 23 24
11 1/4 W 64 5/8 --- --- 24 5/8
11 1/2 W-½ 65 1/4 21 24 25 1/4
11 3/4 X 65 7/8 21 1/4 --- 25 7/8
12 Y 66 1/2 21 1/2 25 26 1/2
12 1/4 Y-½ 67 1/8 --- --- 27 1/8
12 1/2 Z 67 3/4 21 3/4 26 27 3/4
12 3/4 Z-½ 68 3/8 --- --- 28 3/8
13 --- 69 22 27 29