Garlan Chain - Stainless Steel, Brass, Gold, Silver, Steel, Aluminum

Conversion Chart Gauge to Inches to Millimeters
B & S Gauge	Inch (Decimal)	Millimeter (mm)	Inch (Fraction)	B & S Gauge	Inch (Decimal)	Millimeter (mm)	Inch (Fraction)
1	0.289	7.348		17	0.045	1.149
2	0.258	6.543		18	0.040	1.024
	0.250	6.350	¹/₄	19	0.036	0.912
	0.234	5.953	¹⁵/₆₄	20	0.032	0.812
3	0.229	5.827			0.031	0.795	¹/₃₂
	0.219	5.556	⁷/32	21	0.028	0.723
4	0.204	5.189		22	0.025	0.644
	0.203	5.154	¹¹/₆₄	23	0.023	0.573
	0.188	4.762	³/₁₆	24	0.020	0.511
5	0.182	4.621		25	0.018	0.455
	0.172	4.366	¹¹/₆₄	26	0.016	0.405
6	0.162	4.115			0.016	0.396	¹/₆₄
	0.156	3.969	⁵/₃₂	27	0.014	0.360
7	0.144	3.664		28	0.013	0.321
	0.141	3.572	⁹/₆₄	29	0.011	0.286
8	0.128	3.263		30	0.010	0.255
	0.125	3.175	¹/₈	31	0.0089	0.226
9	0.114	2.906		32	0.0080	0.200
	0.109	2.778	⁷/₆₄	33	0.0071	0.180
10	0.102	2.588		34	0.0063	0.160
	0.094	2.381	³/₃₂	35	0.0056	0.142
11	0.091	2.304		36	0.0050	0.130
12	0.081	2.052		37	0.0045	0.114
	0.078	1.984	⁵/₆₄	38	0.0040	0.100
13	0.072	1.828
14	0.064	1.628
	0.063	1.588	¹/₁₆
15	0.057	1.449
16	0.051	1.291
	0.047	1.191	³/₆₄

To find the weight of an article in a metal different from that in which it is now made:

Find the present metal in the first vertical column.
Multiply the present weight by the factor in the same horizontal row under the new metal.
Example: A sterling silver ring weight 8 grams, what will it weigh in 14kt?
Along the horizontal row marked "Stg" in the first column under the heading 14kt we find 1.25
8 x 1.25=10 grams, weight in 14kt

Approximate Comparative Stone Sizes
Diamond Carat Weight		MM Size	Diamond Carat Weight		MM Size
.005	=	1.3	.20	=	3.8
.01	=	1.7	.25	=	4.1
.02	=	2.0	.33	=	4.4
.03	=	2.4	.40	=	4.8
.05	=	2.7	.50	=	5.2
.07	=	3.0	.75	=	5.8
.10	=	3.2	1.0CT	=	6.5
.12	=	3.4	1.5	=	7.4
.15	=	3.4

Conversion Chart