Welcome to KADIAM

An Independent Diamond Expertise and Valuation Consultant

I would like to present our independent rough and polish diamond expertise and valuation  services.

Thanks to our rich experience and data resources including:
periodical polished and rough demands all over the diamond channel,
sales scores, all sizes and all qualities.
Specific literature emanating from industry analysts.

Kadiam representatives meet various polish and rough diamond traders in important manufacture and trade centers and monitor their assortments and prices, which gives us a broad and updated market overview.

The Kadiam team has extensive experience and an excellent track record in rough valuations as well in polished appraisals.

Kadiam has the ability to offer diamond expertise and valuation services to Governments, prospecting and mining projects, tender houses,
Banks, Auditors and other executives.
Introduction image

Diamond Expertise

Assorting rough diamonds. Assorting polish diamonds. Gemological inspection. Inspection of inventories. Expert opinion for court & Auditors.


Run of Mine (ROM) valuations. Inventory valuations. Special stones. Fancy colors.


Kadiam assists in the organisation of diamond sales by tender or direct sales to trade and manufacture centers. As an independent consulting firm, we do not buy or sell diamonds or act as diamond brokers.

Training and skills transfer

Kadiam provides assortments and valuation trainings for advanced level candidates.

Katz Jacob - Jacky, 54, third generation in the diamond Industry.
founder and CEO of Kadiam.

Since 1989, Mr. Katz has been part of the diamond industry and subsequently became a member of the Antwerp Diamantkring, affiliated with the world federation of diamond bourses.

Following an experience garnering period in the assorting, manufacturing stages and pursuing gemological and additional courses in related fields, Mr. Katz performed polished and rough purchases and marketing ,including doing extensive market research in China.

Based on this experience and an incisive, prudent market orientation, Mr. Katz serves as a diamond expert and valuator , specializing in inspection and valuations of inventories and providing expert opinions.

Academic background
Mr. Katz holds a BA in Political and Social Sciences from Bar Ilan University and an MBA from Herriot-Watt University, Edinburgh.
About Kadiam image
  • Tuval Street 21, Ramat Gan, Israel