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Decimal Formula For Gold Jewelry

Monday, April 30, 2007 17:19
Posted in category Antique Collectibles
1 Comment
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Ring Markings Question: I purchased an antique and diamond ring recently.

GOLD METAL TESTING KIT WITH 5 NEEDLES

Price: $51.90 USD

The only markings inside the band are either "698" or "693". It actually looks like 698 on one side and 693 on the other.

I had it tested.  The jeweler said it does not test gold, silver or platinum, however, the opal and diamonds are real and appear to be of good quality.

Any ideas on what this number means?

Thank you.

Answer: G'day and many thanks for your query.

The basic decimal formula to work out the quality of gold content is quite simple, as they are all measured in 'Parts per Thousand.'

This means that 9ct gold is calculated like this:

9 (for 9ct) is divided by pure gold (24) and then multiplied by 1000 (for pure gold as a decimal). ie: 9/24*1000=375

Article Continued Below...

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Tags: Decimal Point, Dental Gold, Dentist, Diamond Gold, Diamond Ring, Diamonds, gemstones, Gold Content, Gold Jewelry, Gold Metal, Gold Ring, Gold Silver, Jeweler, Jewelry Ring, Many Thanks, Needles, Opal, Platinum, Pure Gold, Store Id Number

One Response to “Decimal Formula For Gold Jewelry”

  1. s.lucy says:

    September 16th, 2008 at 2:18 pm

    Hi,I recently bought a 22ct gold bangle from ebay.The seller said she bought it from Tunisia and sold as 22ct.I can’t see any gold hallmarks like 22k or 916.Instead I can see a mark’BREV’ and ‘CSA’on each side of an ‘X’ mark.Please help.Kind Regards,Lucy

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