Solitaire diamond ring, circa 1920

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Solitaire diamond ring. A cushion shape old cut diamond is set to centre in an open back claw setting with an approximate weight of 1.05 carats with elegant pierced claws and flanked by linear etched shoulders leading to a smooth tapered D-shape shank. Tested platinum, circa 1920.

Inside diameter (mm)	USA	UK	China India
11.63	0
11.84	¼
12.04	½	A
12.24	¾	A½
12.45	1	B	1
12.65	1¼	B½
12.85	1½	C
13.06	1¾	C½
13.26	2	D	2
13.46	2¼	D½
13.67	2½	E	3
13.87	2¾	E½
14.07	3	F	4
14.27	3¼	F½	5
14.48	3½	G
14.68	3¾	G½	6
14.88	4	H½	7
15.09	4¼	I
15.29	4½	I½	8
15.49	4¾	J
15.7	5	J½	9
15.9	5¼	K
16.1	5½	K½	10
16.31	5¾	L
16.51	6	L½	11
16.71	6¼	M	12
16.92	6½	M½	13
17.12	6¾	N
17.32	7	O	14
17.53	7¼	O½
17.73	7½	P	15
17.93	7¾	P½
18.14	8	Q	16
18.34	8¼	Q½
18.54	8½	R	17
18.75	8¾	R½
18.95	9	S	18
19.15	9¼
19.35	9½	S½	19
19.56	9¾	T
19.76	10	T½	20
19.96	10¼	U	21
20.17	10½	U½	22
20.37	10¾	V
20.57	11	V½	23
20.78	11¼	W
20.98	11½	W½	24
21.18	11¾	X
21.39	12	Y	25
21.59	12¼	Y½
21.79	12½	Z	26
22	12¾	Z½
22.2	13		27
22.4	13¼
22.61	13½
22.81	13¾
23.01	14
23.22	14¼
23.42	14½
23.62	14¾
23.83	15
24.03	15¼
24.23	15½
24.43	15¾
24.64	16