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Sambhav Karnawat

I have interest & expertise in Platinum Jewelry & Ruby, from Ruby roughs to polished Rubies to Ruby Jewelry. Anything about Rubies, I'd love to talk!


Have a question about jewelry repair or working with precious metal jewelry and gemstones? For many years up to December 31, 2010, I was a working professional bench jeweler, involved everyday with setting stones in mountings, designing and making jewelry, repairing and limited custom manufacture. If you work with jewelry as a hobby or as a profession, I might be able to help. I deal with the retail business, not mass production. Ask privately if you wish. See the box for that: It keeps your question between us. Please DO NOT ask MAKER'S MARKS, but metal quality marks are fine to ask. Please DO NOT ask diamond prices. See a gemologist for that.

Uwe Richard Kackstaetter, Ph.D. (Dr.K)

I can answer questions concerning minerals, mineralogy, gems, metals, and anything that has to do with geology. However, I am NOT a jeweler. Questions about values, settings, gem stone cuts and appraisals are best directed to other experts on this site. I can however aide in the identification of unknown mineral materials. As a public service and part as training for new geoscientists, our university department provides FREE mineral identification for individuals. Please contact me for details or go to for details..

Melinda Nolan

(Please do not send questions about hallmarks or stamps on jewelry. I am not an expert in identifying marks. Thank you.) Feel free to post questions about the process of one of a kind jewelry manufacturing, gemstones, diamonds, the precious metals, industry trends, purchasing, quality, care and maintenance, appraisals, insurance, stone cutting, jewelry repair, etc. I am NOT equipped to answer questions about age or value of a piece without seeing it in person, and even then, I am not an expert in antiques. Nor am I an expert in stamps or marks that are inside the jewelry. There are hundreds of thousands of manufacturer's out there and then you factor in the number of years a piece of jewelry can circulate, it becomes an enormous amount of possibilities. I am really not the right person to ask about such markings.

Rod Keady

all info pertaining to australian opals and opal fields is ok. online valuations is difficult but not entirely impossible. Photographs of stones should clearly show weight in carats and scale in mm. naturally photographs of opals are the hardest thing to take as a slight shift in direction displays a new colour or plane

Rolfe Foxwell

I will answer any questions regarding semi-precious stones or precious stones. I will answer questions regarding mounting both semi-precious and precious stones. I can also answer most questions regarding small manufacturing. I can not answer questions regarding casting or fine jewelry.

Recent Answers

2017-01-04 Green Stones in Bracelet:

Hi Yolanda,    There are some simple self tests you can do to narrow the identity of the green stones. Here are some of the answers on this subject that I have given before:

2017-01-02 Gold Ring:

Hi Lisa,  I am not a jeweler, just an expert in minerals and certain metals, but my understanding is that PSD is a manufacturers mark, especially if it is printed right after the 14k.  Gold plating marks

2016-12-16 Black Opal:

Hi Tim ,  wow man , its taken all my life to understand Opal and value , its not something I can truelly answer in a sentence or paragraph , but many years of experience . and without sounding like a goof

2016-12-15 Removing varnish from amber:

Hi Ruby,    This is going to be a difficult one. Amber is a natural resin and resins can be dissolved in / attacked by various solvents. However, real amber that has hardened over millions of years is

2016-12-14 Value of diamonds:

Artificial diamonds are manufactured commercially in viable operations worldwide, mostly for industrial purposes. There are some commercial laboratories that grow synthetic gem quality diamonds, such as

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