Practical Valuation Techniques - Tutorial

Over three days, the NAJ's brand-new valuation tutorial teaches students essential practical valuation techniques.

You will learn alongside a maximum of twelve individuals and our experienced tutor will also provide one-to-one time to help you to fully appreciate the content of the tutorial and the reasons for adopting the proven techniques outlined.

You will receive a folder containing precise information on all that you have learnt over the three days, plus useful reference documents that can go towards building your own comprehensive valuation portfolio.


Day 1 & 2

  • Descriptive text writing
  • How to properly describe an item, using the correct terminology, (settings, styles, chain patterns, parts of a ring, fittings and clasps.)
  • How to describe watches, period jewellery, pearls and bead necklaces
  • Writing a valuation, layout and presentation (specific examples of good and bad practice)
  • Using limited descriptions for low value multiple items (i.e a grouped lot). Working notes, recording pricing sources and the use of worksheets
  • Valuing modern, mass produced commercial jewellery
  • Valuing antique, rare jewellery, discussing the market data comparison approach as opposed to the cost, deconstructive component parts approach.
  • Cleaning, weighing and identifying
  • Gemmological equipment and tools for the valuer
  • Formulae for assessing diamond and gemstone weights
  • Practical techniques, tips and methods
  • Caution that should be exercised regarding limitations that maybe imposed by the mountings. (i.e. talking about estimated weights, calculated and stated weights.)
  • Care that should be exercised, and when to take into consideration regarding the 'condition' of a jewellery item or watch
  • Assessing and grading diamonds
  • Assessing the four 'C's (cut, carat weight, colour and clarity)
  • Identifying common diamond simulants
  • Identifying treated diamonds (laser and fracture filled)
  • Pricing information for valuing diamonds
  • Diamond grading reports
  • Manufacturing methods
  • Assessing and identifying the method of manufacture, handmade, assembled cast and cad cam mounts - pricing accordingly.
  • Workshop charges and prices - with refence to Barry's Sullivan’s 'Welcome to Valuing Guide'
  • Identifying Hallmarks, hallmarking law present and past historical relevant hallmarking amendments.
  • Foreign marks
  • Metals
  • Other metals used in jewellery modern manufacture
  • Precious metal testing techniques
  • Electronic gold testers, use of XRF

Day 3

  • Assessing and grading coloured gemstones and pearls
  • Coloured gemstones
  • Treatments and enhancements
  • Treatments to include, heat, surface and bulk diffusion, oil, resin and glass filling, dying, composite stones
  • Quality assessment grading. i.e commercial, good, very good and fine with applying appropriate quality reference numbers, working with 'The ‘GemGuide'
  • Applying a colour reference description. With reference to 'World of Colour'
  • Pricing information on coloured gemstones in general. How to arrive at a value. Using different diamond and gemstone price guides and sources appropriately and correctly
  • Sourcing pricing information and data.
What I will need
  • 10x lens
  • Watchmakers eyeglass loupe
  • Leverage measuring guage
  • Scales
  • Calculator


How much will it cost?

£850 + VAT

£765 + VAT for NAJ members

£680 +VAT for CAT students and NAJ Members that belong to the CMJ or the Houlden Group

A 15% discount will be applied to all courses booked by members of the IRV.

To book call Education Coordinator Lyn Oliver on 07776692315 or email


Chloe Thorn

Phone: 0121 237 1135