Vintage diamond eternity ring in platinum, French, circa 1970.

Rings, Eternity Rings, Vintage Rings

€2,486 $2,706 CHF2,640 HK$20,988
Ref: 25795

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Vintage diamond eternity ring in platinum. Set with twenty eight round old cut diamonds in open back grain settings with an approximate combined weight of 0.70 carats, to a smooth conforming band featuring fine rubover borders and intricate square open backholing, with an approximate width of 2.5mm. Marked platinum, French, circa 1970.

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