Jewelry, Gems, & Minerals/ring markings


Photocrazy wrote at 2015-04-13 06:04:24
I know this post is 9 years old but I ran across this looking up makers marks so posting this for others who find this site using a search engine.

STER means Sterling Silver so if it is 2 tone it could be 10K gold and sterling.   I see some companies that make jewelry for Sororities etc. used 10 karat gold over sterling or another metal and mark it GK for Gold casing basically gold plating, maybe heavier, not sure why they don't use GC  or just mark it GP for gold plated, but they use GK and state the meaning on their site.  GK could also just be a makers mark.

If it is marked 10K GK Ster in that order and all close together then I would lean towards the Gold Casing over sterling.  Makers marks are usually separated by a little distance from other markings to show they aren't part of the description.

Jewelry, Gems, & Minerals

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David Foard F.G.A.A.


How Jewelry and Gemstones are Valued or Appraised. This includes items made in Silver, Gold or Platinum set with most gemstones including diamond, sapphire and ruby, emerald, topaz, opal, pearls, tanzanite and most precious and semi-precious gemstones. The Valuation and Appraisals of Antique, Secondhand, Vintage and Fine Old Jewelry - But NOT Costume or fashion jewellery.


Over 35 years in the Jewelry Industry, specializing in Antique and Estate items. Qualified Fellow of the Gemological Association of Australia (F.G.A.A.) and former Member of the Valuers Council (now retired). Former Teacher at Wollongong University and other colleges

now running the Jewelry Appraisal Center where anyone can do their own appraisals ONLINE.

Many Articles published around the Web on the subject of Jewelry Valuation and Appraisals. Expert Author at and writer of the successful 'How to Value your Jewelry from Home or Work' series of courses and books.

Qualified Gemmologist 1986
Fellow of the Gemological Association
Registered Jewelry Valuer 1987
Former Member of the Jewellery and Allied Trades Valuers Council

Awards and Honors
Winner of many writing awards in both fiction and non-fiction. Member of the Australian Society of Authors.

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