Laboratory-Grown Diamond Quality Verification

At Lightbox we guarantee the standard of each of our lab-grown stones inscribed with our official mark of quality. The below quality bands detail each of our lab-grown diamonds cut, color and clarity specifications.

GIA Quality Verfication

As part of Lightbox’s quality requirements, statistically selected Lightbox laboratory-grown diamonds are examined by GIA (Gemological Institute of America) to verify they are laboratory-grown diamonds and meet Lightbox’s assured quality standards.

Round Brilliant GIA verified

Round Brilliant

Princess

Cushion

Oval

Emerald

Asscher

Baguette

Heart

Trillion

Outlet

FAQs

GIA Verification & Technical Specifications

Product Changes

US	UK	Europe	Inside circumference (mm)	Inside circumference (inches)
5	J	48.5	49.3	1.94
5.5	K	50	50.6	1.99
6	L	51	51.9	2.04
6.5	M	52	53.1	2.09
7	N	55	54.4	2.14
7.7	O	56	55.7	2.19
8	P	57	57.0	2.24
8.5	Q	58.5	58.3	2.29
9	R	59	59.3	2.34

Carat Weight	Min Carat Weight	Max Carat Weight	Diameter Girdle (approx. min. in mm)	Diameter Girdle (approx. max. in mm)
½	0.47	0.52	5.0	5.3
¾	0.71	0.78	5.6	6.0
1	0.95	1.05	6.2	6.6
1½	1.46	1.57	7.1	7.5
1¾	1.70	1.83	7.5	7.9
2	1.95	2.10	7.9	8.3
2¼	2.20	2.36	8.3	8.7
2½	2.45	2.62	8.5	8.9
3	2.95	3.15	9.2	9.6

Carat Weight	Min Carat Weight	Max Carat Weight	Length (approx. min. in mm)	Length (approx. max. in mm)
½	0.47	0.52	4.1	4.3
⁵⁄₉	0.52	0.57	4.3	4.5
⅝	0.59	0.65	4.5	4.7
¾	0.71	0.78	4.8	5.0
⅞	0.83	0.91	5.0	5.2
1	0.95	1.05	5.3	5.5
1½	1.46	1.57	6.1	6.4
1¾	1.70	1.83	6.4	6.7
2	1.95	2.10	6.6	7.0
2¼	2.20	2.36	6.9	7.3
2½	2.45	2.62	7.1	7.5
2¾	2.70	2.88	7.4	7.8
3	2.95	3.15	7.6	8.0

Carat Weight	Min Carat Weight	Max Carat Weight	Length (approx. min. in mm)	Length (approx. max. in mm)
½	0.47	0.52	4.3	4.5
⅝	0.59	0.66	4.6	4.8
¾	0.71	0.78	4.9	5.1
⅞	0.83	0.92	5.2	5.4
1	0.95	1.05	5.4	5.6
1½	1.47	1.57	6.3	6.7
1¾	1.72	1.83	6.6	7.0
2	1.95	2.10	6.9	7.3
2¼	2.20	2.36	7.2	7.6
2½	2.45	2.62	7.3	7.7
2¾	2.70	2.88	7.6	8.0
3	2.95	3.15	7.8	8.2

Carat Weight	Min Carat Weight	Max Carat Weight	Length (approx. mm)	Width (approx. mm)
1	0.95	1.05	6.6	4.7
1½	1.46	1.57	7.6	5.4
1¾	1.70	1.83	8.0	5.7
2	1.95	2.10	8.3	6.0
2¼	2.20	2.36	8.7	6.3
2½	2.45	2.62	9.0	6.4

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Laboratory-Grown Diamond Quality Verification

GIA Quality Verfication

Round Brilliant GIA verified

Loose Stone Quality Verification

Round Brilliant

Loose Stone Quality Verification

Jewelry Quality Verification

Princess

Loose Stone Quality Verification

Jewelry Quality Verification

Cushion

Loose Stone Quality Verification

Jewelry Quality Verification

Oval

Loose Stone Quality Verification

Jewelry Quality Verification

Emerald

Loose Stone Quality Verification

Jewelry Quality Verification

Asscher

Loose Stone Quality Verification

Baguette

Loose Stone Quality Verification

Jewelry Quality Verification

Heart

Jewelry Quality Verification

Trillion

Jewelry Quality Verification

Outlet

Loose Stone Quality Verification

Jewelry Quality Verification

FAQs

GIA Verification & Technical Specifications

Why is there GIA verification only on certain lab-grown diamonds?

How does the GIA verification work?

Why are technical specifications no longer printed?

Product Changes

Why are your DEF stones (formerly Finest) now VS+?

Why did you change your color grades? Why do you not provide stones at a single-color grade?

Why does the setting cost vary?

Does your price drop impact any of your social commitments?

Shipping & Returns

Shipping

Returns

Ring Size Guide

Size Conversion Chart

Check the size of your existing ring

Helpful Hints

Guide

Round Brilliant Stones

Princess Cut Stones

Cushion Cut Stones

Emerald Cut Stones

Oval Cut Stones

Asscher Cut Stones

Baguette Cut Stones

Trillion Cut Stones

Heart Cut Stones

Pear Cut Stones

Quality Guaranteed

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