Services

What we can test for you

Most clients start with a single-stone identification or diamond grading. Complex stones, mounted jewelry and origin opinion reports may take longer.

Gemstone Identification

Standard identification of natural, synthetic and imitation stones, with reference notes for the report reader.

Treatment Detection

Detection of common treatments including heating, fracture filling, irradiation and clarity enhancement.

Diamond 4C Grading

Independent diamond grading covering Carat, Colour, Clarity and Cut, observed under standardised conditions.

Origin Opinion

Origin opinion reports for ruby, sapphire and select spinel, based on microscopic and spectroscopic observation.

Coloured Stone Testing

Full colored stone grading and descriptive reports for sapphires, rubies, spinel, garnet and similar species.

Jade & Jadeite Testing

Identification of natural, treated and imitation jadeite-jade, including polymer and acid treatment detection.

Pearl Identification

Identification of natural, cultured and imitation pearls, with notes on treatment and origin where applicable.

Jewelry Authentication

Authentication of mounted jewelry for traders, retailers and private collectors — stones in setting evaluated alongside metal notes.

Report formats

How the report is delivered

Reports are produced on YGIL letterhead and printed in our Tamwe office. Each report includes a photo of the stone, observations, instrument tests, and the lab's conclusion. A summary in plain language is available on request.

Larger origin reports include micro-photographs and a documented examination trail.

Have a stone to submit?

Get a quote from the YGIL lab

Send us the species, approximate weight, shape, and any prior reports — we will reply with a quote and an estimated turnaround.