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  Whatever the query, We'll take care of it:
  Monday-Friday 9:00 am - 5:30 pm
  Saturday 9:00 am - 1:00pm
(Only infrared testing service is available)
   
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Laboratory
The Hong Kong Jewellery & Jade Manufacturers Association established the Hong Kong Jade & Stone Laboratory Ltd. (HKJSL) in 1993.
Equipped with the advanced instrumentation, our experienced gemmologists can test jade accurately and issue authenticated certificates to the public.
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How to choose "A Jade"
In the jade industry, terms of jadeite classifications like "A" Jade, "B" Jade, "C Jade" and "B+C" Jade are used, but they are by no means jadeite grading.
"A", "B", "C" goods are trade terms commonly used for Fei Cui (Jadeite Jade) in the jade industry, not representative of its grading. Myanmar (Burma) is the major source of Fei Cui (Jadeite Jade).
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Trade Descriptions (Definition of Fei Cui and Natural Fei Cui) Regulation, The Customs and Excise Department
Chapter: 362K Gazette Number: L.N. 265 of 2008 Version Date: 02/03/2009
Definition of ‘fei cui’ (Section: 2)
The expression ‘fei cui’ or ‘翡翠’, when used in the course of any trade or business to describe an article, means the article is a granular to fibrous polycrystalline aggregate which is composed solely or principally of any of the following or any combination of the following: (a) jadeite; (b) omphacite; (c) kosmochlor.
 
Definition of ‘natural’ when used to describe fei cui (Section: 3)
The expression ‘natural’ or ‘天然’, when used in the course of any trade or business to describe fei cui within the meaning of section 2, means the fei cui: (a) has not been subjected to any treatment or process which altered its crystalline structure; and (b) has not been subjected to any treatment or process which altered its original colour.
 
 
 
Instruments
The Hong Kong Jade & Stone Laboratory carries out jadeite testing and certification services in an impartial and objective manner, enabling both consumers and jewellery traders to have a clear understanding as to whether their jadeite is natural or chemically treated.
The laboratories are well resourced with the latest equipment, to ensure maximum reliability in testing:
 
•Diamond Balance
•Microscope
•Heavy Liquid Set
•Dichroscope
•Microvision
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