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?

Non-member - £875+VAT

Member - £785+VAT

CAT students/CMJ/Houlden members - £699+VAT

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

 Booking is subject to the following Terms and Conditions


Chloe Thorn

Phone: 0121 237 1135