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Jewelry Making/Testing for gold

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Question
Dear Chris, I recently purchased a 10k gold necklace and used an acid test to see if this is genuine 10k gold.  I scratched the necklace on the stone and applied 10k acid.  Initially, the gold does not dissolve at all.  Then after about 35 seconds, there is no trace of gold left on the area where acid was applied.  
  Does this mean that this necklace is not 10k solid gold?  

I am puzzled because when I had previously applied acid to non-gold item, the metal normally disappears right away or bubbles then disappears.  However, this gold remains undissolved but after about 20 seconds, it starts to dissolve until it is completely dissolved after about 35 seconds.  
  I urgently need your assistance.

Answer
Laura,
Depending on the acid, and the color of the gold as well as the actual karat, it sounds like you may have a little under karated gold. You might even have plated gold. You might try filing the piece and retesting the filed area. I always liked to compare a test piece of gold to the item you are testing, because different concentrations of acid could decay at different rates.
From your description I noticed that you said 10k and not 10kp which means exact vs a little room for error. This may also be a factor. The p stands for plumb meaning exactly  the # stamped.  I hope this helps you with your delima.
C

Jewelry Making

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Chris Eilertsen

Expertise

I have been in the Jewelry Industry 20 years and Apprenticed as a silver smith took classes in Casting sculpting repair and trained under master gold and silver smiths as well as some experience in Faceting and diamond cutting and polishing for repair. Plating, Wax work, Diamond Setting, Engraving, Carving, Mold Making, design, some watch repair, tool making, enamel work, refining, mining, sales, sand blasting, casting. Have worked in Platinum, Gold, Silver, Pewter, Brass, Bronze, Aluminum,Steel,Titanium,Wood, Plastic, and Stone. 10 years Appraisal work in Jewelry.

Experience

20 years commercial experience in Repair Manufacturing and sales of Jewelry 3 years school 4 year apprentice. Worked on the duplication of the treasure found on the Spanish Galleon Maravalla by Dr. Cecil Humphreys. Traveled with and manufactured the souvenirs and miscellaneous replicas from the King Tut Exhibit when it visited the US.

Organizations
Former member AGTA and GIA and a ten year member of Memphis Jewelers association. 17 years experience in Tuscon Jewelry shows buying and selling.

Publications
JCK Tuscon Show Gude

Education/Credentials
Classes at MSU and The Memphis art academy in Jewelry sculpting, Specialized Repair school, and 2 apprenticeships in Silversmithing from Juelius Astor, and Goldsmithing from Katchic Yacubian both masters for over 35 years each.Studied with Dr. Richard Prilliman, and several others.

Awards and Honors
JCK Tuscon Show honorable mention in design.

Past/Present Clients
Dr. Cecil Humphreys Finder of the Spanish Galleon Maravalla, The Vanderbilts, Miscellaneous repair antique estate pieces. Elvis Presley Repair and Appraise 2 pieces of jewelry. Rifat Hassan and Nihall Mumtaz With the King Tut Exhibit. Trade work for over 36 Major Chains from Zales to Sams.

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