Solitaire diamond engagement ring by Tiffany

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Solitaire diamond engagement ring by Tiffany & Co. Set with a central round old cut diamond in an open back claw setting with an approximate weight of 0.72 carats, with circular backholing and intricate scalloped claws, flanked by elegant shoulders flowing down to a solid D-shape shank. Marked platinum and iridium, signed 'TIFFANY & CO', American, circa 1950.

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