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.
El registro
Qué abarca
Los informes que publica
Se denomina tal y como lo indica el laboratorio en su propia página web. El contenido y la redacción del informe los establece el laboratorio, no nosotros.
- 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
Información de interés
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.
Recopilado de cgl.co.jp; puede consultarse en 16 de agosto de 2026.
Verificamos a los comerciantes, no las piedras. Un informe de laboratorio describe una piedra en una fecha concreta; no constituye una garantía de valor, y no nos corresponde a nosotros respaldarlo.