| Japan Technical Gem Laboratory (TGL Japan): Address: Hanabusa Bldg. 2nd Floor 5-2-3 Soto Kanda, Chiyoda-ku Tokyo 101-0021 Japan Tel: 03-3834-5491 Fax: 03-3834-5492 Locations: TGL Nagoya Laboratory 3-2-9 Sakae, Naka-ku Nagoya, Japan Tel: 052- 264-3027 Fax: 052-264-3028 TGL Osaka Laboratory 2-11-13 Minami Senba, Chuo-ku Osaka, Japan Tel: 06- 241-1585 Fax: 06-542-0081 Tokyo Gem Laboratory (Thailand) Co., Ltd. 55/11 501 Charoenkrung 42/1, New Road, Bangkok Thaailand Tel: 66-2- 2357324 Owner: Three separate private corporations operating under the same name. Kunihiko Jogan, President Tokyo Laboratory Shoji Yamazaki, President Nagoya Laboratory Hiroko Niinobe, President Osaka Laboratory Specialization: Diamond grading and gem identification. Special Equipment: Diamension FTIR Services Offered: Diamond grading, and gem identification, seminars for retailers employee training. Certificate/Report: Carat weight, colore, clarity, cut (symmetry and polish), cut grades (5 grades as defined by AGL rules: Excellent, Very Good, Good, Fair and Poor). Educactional Programs: Certification Programs are not available. Private classes are held for clients. |
Gem Science Laboratory: Address: Miyachi Main Bldg. 6Floor 4-30-8 Taito Taito-ku Tokyo Japan Tel: 03-383-325521 Fax: 03-383-325504 Locations: Osaka Branch is scheduled to open on March 1, 1999 Owner: Private Corporation Yoshiki Kikuchi, President Specialization: Sorting (pre-grading) shooting gem photography, shooting gem pictures under microscope. Special Equipment: Diamension, a special camera for gem photography. Services Offered: Issuance of Diamond Grading Report and Gem Identification report. Certificate/Report: Gem Identification Reports come in three diffrent size. in full identification report: Identification conclusion, appearance, shapes, weight, size, date of test, refractice index, optic character, specific gravity, hardness, magnification, fluorescence, pleochroism, absorption spectrum, material, remarks and picture of identified stone, mounted or unmounted. In medium ID Report: Conclusion, shape, appearance, weight, size, comments, list of gemstones and picture of stone(s) identified in mounting. In pocket-size ID: Size, measurements, identifiction conlusion, inscription found on mounting, if any enhance- ment or treatment and pictur of stone(s) identifode in mounting. Deamond grading reports come in two diferent size. In full grading report: Shape and cut, measurments, weight, clarity grade, JJA/AGL verified master stone number, color grade, Fluorescence cut grade (AGL standard), propo- rtions (depth percent, table percent,girdle description, culet description), finish (polish, symmetry), comments, color grading scale, clarity grading scale, and picture of graded diamond. In pocket-size report: Carat, color, clarity, cut, shape, size, fluorescence, proportions (depth percent, table percent, girdle dscription, culet description), finish (polish and symmetry) comments and picture of graded diamond. Educactional Programs: Certification rograms are not available, but seminars for retailers are held on request. |
Central Gem Laboratory: Address: Miygi Bldg., 5-15-14 Ueno, Taito-ku Tokyo 110-0005 Japan Tel: 03-3836-3219 Fax: 03-3832-6861 Locations: Okachimachi Branch: Taiyo Bldg. 2nd Floor 5-15-17 Ueno Taitoku 110-0005, Japan. Nagoya Branch: Sakaecho Nishikan Bldg. 5th Floor, 3-22-13 Nishiki, Nagoya-shi, Aichi 460-003 Japan Osaka Branch: Idemitsu Nagohori Bld. 4th Floor 3-4-26 Minami Senba, Chuo-ku Osaka 542-0081 Japan. Hakata Branch: BS Bldg. 2nd Floor, 3-19-14 Hakata Ekimae, Hata-ku Fukuoka 812-0011, Japan Antwerp Branch: c/o HRD, Hoveniersstraat 22B-2018 Antwerp, Belgium. Kofu Office: Teleport Bldg. Hara 2nd Floor 2-16-2 Aioi, Kofu, Yamanashi 400-0858, Japan Diamond Museum: Jewelers Town Oramu 4th Floor 1-26-2 Higashi Ueno, Taito-ku Tokyo 110-0005, Japan Owner: Private Corporation Nobuo Horiuchi, President. Specialization: Diamond grading and gem identification. Special Equipment: EDX (Energy Dispersive X-ray Fluorescence), Laser Tomography, FT-IR (Fourier Transform Infrared Spectrophotometer), Ultra Violet Visible Recording Spectrophotometer, Soft X-ray Radiography Aparatus, Multi-task Polarizing Microscope, Colorimeter, Spectrolino, Cape Detector. Services Offered: Diamond grading, gem identification, education, research, publishing. Certificate/Report: On Gem identification: Description of cuts, weight, identification of color stones, description of treaments and enhancement (according to AGL Association of Gemological Laboratories) if any Stones are identified as loose or mounted. In the case of mounted stones, appearance (in jewelry) is also reported. Apart from Gem Identification Report, Analysis Report is issued identifying the origin of stone and existence of enhancement. On Diamond Grading Report: cut,carat, color, clarity, cut grade. Grading reports are issued on loose stones and mounted stones, however mounted, stones must be pre-sorted by CGL. Treated stones are not graded according to AGL rules. Educactional Programs: CGL DC (Diploma of central Gem Laboratory) is given to those who complete the CGL course. The five-month course teaches basic knowledge of gems, identification of gems, and grading. |
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