About us

Beauty, meet precision.

Our story

A sister brand of George Diamonds

We started Josh & John Designs because we believe brilliance shouldn't come at the earth's expense. As lab-grown diamond technology has reached a point where the stones are chemically, optically, and structurally identical to mined diamonds, the choice has never been easier or more responsible.

We are a trusted B2B and B2C company of premium lab-grown diamonds. Crafted with precision, integrity, and innovation, our diamonds add sparkle to every creation and value to every relationship. We are a member of the Thai Gems and Jewelry Traders Association.

We are a sister company of George Diamonds. George Diamonds focuses on natural diamonds; Josh & John Designs focuses on lab-grown fancy diamonds.

Sister company

Four lab-grown diamonds held in a jeweller's tweezers

Why lab-grown

The same diamond, a better story

What it is

A real diamond: identical carbon crystal structure, hardness and brilliance to a mined diamond, grown in a controlled environment.

Sustainable

No open-pit mining, with a far smaller land and water footprint.

Ethical sourcing

Full traceability from growth to setting, with no conflict concerns.

Value

Typically 70 to 80% less than comparable mined diamonds, depending on size and quality.

How it's made

HPHT and CVD

	HPHT	CVD
Method	High pressure, high temperature, recreating conditions deep in the earth	Chemical vapour deposition: carbon builds up layer by layer from a gas
Starting point	Diamond seed in a carbon source	Thin diamond seed plate
Growth shape	Cuboctahedral	Tabular / cubic
Typical strength	Fancy colours, smaller sizes	Larger white stones
Result	A real diamond, graded by IGI or GGL	A real diamond, graded by IGI or GGL

Process diagram

Watch on YouTube

Authenticity & certification

Every loose stone, certified

Every loose diamond from Josh & John Designs comes with a certificate from IGI (International Gemological Institute), our primary grading partner, or GGL (Global Gemmological Laboratories), which grades and certifies diamonds and other precious stones. Jewelry does not come with certificates.

Sample IGI laboratory grown diamond report — IGI sample certificate

Sample Global Gemological diamond grading report and gem identification report, with folded report covers below — GGL sample certificate

How to verify

Find the report number on your certificate (it is also laser-inscribed on the stone's girdle).
Open the lab's report lookup and enter the number.
Check the shape, carat, colour and clarity match your certificate.

IGI report lookup GGL report lookup