Vintage citrine dress ring by Boucheron, Fren

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Vintage citrine dress ring by Boucheron. Set with an oval cabochon natural unenhanced citrine in an open back rubover setting with an approximate weight of 5.00 carats, to a raised swirling form with thick trumpeting shoulders, terminating in a solid D-shape shank. Marked 18 carat gold, maker's mark, signed 'BOUCHERON', numbered 'A989 C906', 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