Sapphire and diamond coronet cluster, German, circa 1900.

Name: Sapphire and diamond coronet cluster, German, circa 1900.
SKU: 29974
Price: 9900.00 GBP
Availability: InStock

18ct Yellow Gold, Diamond, Sapphire

£9,900

and coronet . Set to center with one no heat sapphire in an setting with an approximate weight of 1.10 , encircled by ten cushion shape in open back with an combined weight of 1.50 carats, all to an elegant design featuring polished edges, an intricately pierced and fancy open back holing leading to carved that taper through to a solid . 18 carat yellow , makers mark 'Koch', German, 1900, accompanied by Gemmological Certification Services (GCS) report #5786-2993.

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Reference Number 29974

Origin Germany

Ring size: K½

Size Guide

Can be adjusted to any size.

Period Victorian

TOTAL / RING Weight 4.06 grams

Gemstone Basaltic Unheated Sapphire, Mixed Cut, approximately 1.1ct 10 x Diamonds, Old Mine, approximately 1.5ct total

Condition

This ring is in excellent condition.

Director's Notes

Founded in Frankfurt am Main in 1879 by Robert Koch (1854–1902), Koch became one of Germany’s most prestigious jewellery houses. Joined by his brother Louis Koch (1862–1930), the firm earned an international reputation for exceptional craftsmanship, refined design, and royal patronage. Between 1898 and 1918, Koch created more than 700 tiaras and crowns, supplying European royal courts and aristocratic families. Often referred to as the “Cartier of Germany,” the family-owned house remained active until its closure in 1986.

Delivery & Returns

Inside diameter (mm)	USA	UK	China India	European
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		41
13.26	2	D	2	42
13.46	2¼	D½
13.67	2½	E	3	43
13.87	2¾	E½
14.07	3	F	4	44
14.27	3¼	F½	5	45
14.48	3½	G
14.68	3¾	G½	6	46
		H		47
14.88	4	H½	7
15.09	4¼	I		48
15.29	4½	I½	8
15.49	4¾	J		49
15.7	5	J½	9	50
15.9	5¼	K		51
16.1	5½	K½	10
16.31	5¾	L		52
16.51	6	L½	11
16.71	6¼	M	12	53
16.92	6½	M½	13
17.12	6¾	N		54
17.32	7	O	14	55
17.53	7¼	O½		56
17.73	7½	P	15
17.93	7¾	P½		57
18.14	8	Q	16
18.34	8¼	Q½		58
18.54	8½	R	17	59
18.75	8¾	R½
18.95	9	S	18	60
19.15	9¼
19.35	9½	S½	19	61
19.56	9¾	T
19.76	10	T½	20	62
19.96	10¼	U	21
20.17	10½	U½	22	63
20.37	10¾	V		64
20.57	11	V½	23
20.78	11¼	W		65
20.98	11½	W½	24
21.18	11¾	X		66
21.39	12	Y	25	67
21.59	12¼	Y½		68
21.79	12½	Z	26
22	12¾	Z½		69
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

Next day delivery Tuesday to Saturday before 1pm – order by 4:30pm	Complimentary
Nominated day delivery Tuesday to Saturday	Complimentary
Same Day Delivery within London Monday to Saturday – order by 3:30pm	£100

USA 7-10 business days - complimentary fully insured shipping	Complimentary
Europe and Rest of World 7-10 business days - complimentary fully insured shipping	Complimentary

Sapphire and diamond coronet cluster, German, circa 1900.

18ct Yellow Gold, Diamond, Sapphire

£9,900

About the Period

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