Independent Jewellery Appraisals & Expert Advice Since 1995

Gem Logic, incorporating Mark Nixon Jewellery Consulting, provides independent appraisals and jewellery advice to both trade and retail customers in Adelaide and South Australia.

We offer competitive rates and a fast turn-around time, but more importantly, we are NCJV qualified, are truly independent, have decades of experience, have a fully appointed laboratory and an excellent reputation across the jewellery industry.

Whatever your jewellery valuation needs are, come in and see us.

Prices start from $80, see our full price list here.

gem logic
Expert independent Adelaide jewellery appraisals
NCJV registered and qualified jewellery valuers in Adelaide

Adelaide’s First & Most Experienced Independent Jewellery Appraiser with a Walk-In Service Direct to the Public

All of our appraisers are registered and qualified with the National Council of Jewellery Valuers (NCJV) who are the premier professional valuation body in the jewellery industry.

  • Jewellery Appraisals
  • Diamond Certificates
  • Gemstone Identification
  • Gemmological Advice
  • Insurance Advice
  • Specialised Valuations
Valuation Services

Servicing Adelaide’s retail customers and the jewellery trade with independent and professional jewellery appraisals, gemmological laboratory services, gemstone grading and general jewellery advice.

Jewellery valuation for insurance purposes

Insurance Valuation

Our jewellery appraisal certificates are accepted by all major insurance companies and brokers as a basis for undertaking insurance.

Diamond valuation certificates

Diamond Certificates

These certificates can give piece of mind if you are looking to sell or buy a loose diamond from a retailer or other party.

Jewellery valuation for estate division purposes

Estate Division Purposes

These documents will satisfy all parties concerned and can greatly aid in a fair and equitable division of an estate.

Need a Valuation?

Just bring your jewellery item/s in to Gem Logic:


4th Floor, 55 Gawler Plc. Adelaide
(click address for map)


Mon to Fri, 9am - 3pm
(no appointment necessary)

Most valuations take 4 working days. However, if you need your appraisal urgently, please book in a priority service.

Valuations start at $80, see prices here.