tension ring maker+ jewelry shops

What are your opinions on the 2. I heard that Kretchmer has 2 patents on the design and the process of tension settings. I'm not sure if GAI rings have any patents, but they are roughly $500 cheaper. I would like to know their reputation and quality in the industry.

I'm looking to put a .85 ct, H, AGS Ideal, VS2. But I was mezmorized by an AGS000, F, .80 diamond.
The jeweler said that F and higher produce a faint blue glow in sunlight and that anything lower will not produce that effect. Is that true?

I live in California and a mom/pop jewelry store sell the Kretchmer and a semi-chain (Robbins Brothers) sells the GAI rings. Do I buy from a larger chain (RB) a lifetime warranty (even for tensions!) or do I go for the hosh-posh mom-n-pop store (who have higher quality stock). I'm worried about either company disappearing in a couple years, and that is why I was wondering what you nice people think.

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StevL Dems Jewelers Eightstar Diamond Tundra Diamonds

Cheers,
Steve

I have never heard this about F and higher. It is sometimes said about fluorescent stones, but that is not an absolute either.

I defer to the experts, but I don't think the statement is true.

The Rodentman

"I have never heard this about F and higher. It is sometimes said about fluorescent stones, but that is not an absolute either."

Great answer Rodentman.

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StevL Dems Jewelers Eightstar Diamond Tundra Diamonds

Cheers,
Steve

What is your opinion about buying the non-Kretchmer ring at a small chain jewelry store, or buying the Kretchmer from a small mom-n-pop shop (who may go out of business)?

As always, thanks in advance for the advice and knowledge.

I can tell you and mom and pop store will more than likely bend over backwards to make you happy today and tomorrow.

The chain store will have a change of employees at some time, probably sooner than later.

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StevL Dems Jewelers Eightstar Diamond Tundra Diamonds

Cheers,
Steve