Art Deco diamond engagement ring, circa 1925

€4,218 $4,978
Ref: 20884

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Art Deco diamond engagement ring. Centrally set with a cushion shape old cut diamond in an open back grain set box collet setting with an approximate weight of 0.60 carats, to an openwork collet with intricate backholing and flanked by gently sloping shoulders, leading down to a solid D-shape shank. Marked platinum, circa 1925.

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