CENTRAL GEM LABORATORY Co., Ltd.
The Japanese trade uses CGL for diamond grading reports and for gem identification, including analytical reports on unheated corundum, jade and pearl.
Rekorden
Hvad det dækker
De rapporter, som organisationen udgiver
Navngivet således, som laboratoriet selv angiver det på sin egen hjemmeside. Rapportens indhold og ordlyd fastlægges af laboratoriet, ikke af os.
- Grading Report
- Diamond Report
- Diamond Data Report
- Heart & Cupid Proportion Report
- Colored Stone Identification
- Unheated Corundum Report
- Beryllium Diffusion-Treated Corundum Analysis Report
- Paraiba Tourmaline Analysis Report
- Alexandrite Analysis Report
- Jade Analysis Report
- Pearl Layer Thickness Measurement Report
- Non-Nucleated Pearl Report
Godt at vide
The primary site is in Japanese with a reduced English section. CGL states that from November 2025 it accepts origin determination for corundum, emerald, Paraiba tourmaline and alexandrite, and that some localities are too similar for a specific origin to be stated. The diamond report lookup and the gem identification report lookup are separate tools.
Samlet fra cgl.co.jp, læs mere på 16. august 2026.
Vi kontrollerer forhandlere, ikke ædelstene. En laboratorierapport beskriver en bestemt ædelsten på en bestemt dato; den udgør ikke en værdigaranti, og det er ikke vores ansvar at stå inde for den.