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03-3836-5485
月〜金 10:30〜17:00
TEL
03-3836-5485
Mon–Fri 10:30–17:00
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Japan Gem Grading Center

Japan Gem Grading Center (GGC) is a gemological laboratory established in 1981 in Okachimachi, Tokyo — Japan's premier gemstone district.
We issue gemstone identification reports and diamond grading reports.

No appointment necessary Walk-ins welcome during business hours Written communication available
Our Services

Services

Colored Gemstone

Colored Gemstone
Identification Report

Scientific identification of gemstones including determination of natural, synthetic, or imitation origin.
Treatment information is noted where applicable.
Also available for all pearl varieties.

A4 (tri/bi-fold) Full report with detailed examination data including refractive index, specific gravity, color, size, and more.
Mini (bi-fold) Standard report with key data including refractive index, specific gravity, fluorescence, color, and size. 213×160mm.
Mini-Mini (bi-fold) Compact report covering gemstone name, shape, and weight. Color and size data are not included. 159×105mm.

Diamond

Diamond
Grading Report

4Cs (Carat, Color, Clarity, Cut) grading report for natural diamonds.
 Available in two formats.

A4 (tri/bi-fold) Comprehensive report including 4Cs, table diameter, girdle thickness, culet size, polish, and symmetry grades.
Mini (bi-fold) Compact format with 4Cs, size, and fluorescence. 213×160mm.
Fee Schedule

Pricing

All prices include tax and protective cover.

Colored Gemstone Identification Report

Format Size Price (tax incl.)
A4 (tri-fold / bi-fold) A4 ¥2,640
Mini (bi-fold) 213×160mm ¥1,650
Mini-Mini (bi-fold) 159×105mm ¥1,100

Diamond Grading Report

Format Size Price (tax incl.)
A4 (tri-fold / bi-fold) A4 ¥3,960
Mini (bi-fold) 213×160mm ¥2,750

Options

Option Price (tax incl.) Note
English text Free All reports except Mini-Mini
English text (Mini-Mini) +¥330 / report
Same-day express +¥1,100 / report Subject to availability

* Same-day express is not available for Hanadama Pearl certificates.

Location

Access

Address Ishizuka Building 4F, 5-15-16 Ueno, Taito-ku,
 Tokyo 110-0005
Nearest Station 4-min walk from JR Okachimachi Station (South Exit)
1-min walk from Tokyo Metro Nakaokachimachi Station (Exit 2)
Hours Monday–Friday, 10:30–17:00
Closed Weekends and national holidays
Appointment No appointment necessary
Payment Cash only
TEL 03-3836-5485
 (Japanese language only)
FAX 03-3836-3202
Written communication in English is available at our office.
Phone inquiries are in Japanese only.
Visitor Information

Before Your Visit

1

No appointment required

Bring your gemstones to our office during business hours.
Walk-ins are always welcome.

2

Written communication available

English written communication is available at our office.
Phone inquiries are in Japanese only.

3

Payment by cash only

Please bring cash.
Credit cards and electronic payments are not accepted.

4

International shipping not available

We do not offer international shipping.
Please arrange pickup or domestic delivery.

Visit Us

We look forward
to your visit

No appointment necessary.
 Please visit us during business hours.

Phone (Japanese only)

03-3836-5485

Mon–Fri 10:30–17:00
Closed on weekends & holidays