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Newest topics and users posts
23 Jul-18:40:43 Re: black, metallic, yellow oxide? (Bob Carnein)
23 Jul-17:36:31 Re: black, metallic, yellow oxide? (Linus)
23 Jul-17:34:00 Re: black, metallic, yellow oxide? (Linus)
23 Jul-09:37:34 Re: help identify this rock. Sapphire?? (James Catmur)
23 Jul-09:03:02 Re: unknown mineral from pikes peak pegmatite (Bob Morgan)
23 Jul-07:27:50 Re: black, metallic, yellow oxide? (Susan Robinson)
23 Jul-02:23:46 Re: mineral talks live - episode 41 - alan hart - ceo; gem-a, london, england, united king (Tobi)
23 Jul-02:20:06 Re: hillman hall of minerals and gems (Tobi)
23 Jul-02:15:45 Re: black, metallic, yellow oxide? (Tobi)
23 Jul-02:03:58 Re: help identify this rock. Sapphire?? (Tobi)
22 Jul-22:56:37 Re: help identify this rock. Sapphire?? (Steveb)
22 Jul-22:46:39 Re: help identify this rock. Sapphire?? (Gentrydodd)
22 Jul-22:44:53 Re: help identify this rock. Sapphire?? (Volkmar Stingl)
22 Jul-22:41:14 Help identify this rock. Sapphire?? (Gentrydodd)
22 Jul-22:05:14 Re: help identify this rock (Alexsolis)
22 Jul-22:00:01 Re: help identify this rock (Matt_zukowski)
22 Jul-20:07:46 Help identify this rock (Alexsolis)
22 Jul-16:58:25 Re: black, metallic, yellow oxide? (Linus)
22 Jul-15:30:24 Re: black, metallic, yellow oxide? (Linus)
22 Jul-15:20:13 Re: black, metallic, yellow oxide? (Linus)
22 Jul-12:43:41 Re: hillman hall of minerals and gems (Riccardo Modanesi)
22 Jul-09:56:35 Re: unknown mineral from pikes peak pegmatite (Bob Carnein)
22 Jul-03:47:30 Re: black, metallic, yellow oxide? (Tobi)
21 Jul-20:37:55 Re: black, metallic, yellow oxide? (Linus)
21 Jul-20:28:03 Re: black, metallic, yellow oxide? (Pete Richards)

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  Topic: Hillman Hall of Minerals and Gems
Tom Mazanec

Replies: 9
Views: 1307

PostForum: Other Museums in USA   Posted: Jul 21, 2021 12:24   Subject: Re: Hillman Hall of Minerals and Gems
These are the stones I got from the museum souvenir shop. What minerals would these polished rocks be? Are they different species or a porous one that can be dyed? Or something else?
  Topic: Hillman Hall of Minerals and Gems
Tom Mazanec

Replies: 9
Views: 1307

PostForum: Other Museums in USA   Posted: Jun 12, 2021 09:36   Subject: Re: Hillman Hall of Minerals and Gems
Here is the T-shirt I bought at the museum.
  Topic: Hillman Hall of Minerals and Gems
Tom Mazanec

Replies: 9
Views: 1307

PostForum: Other Museums in USA   Posted: May 08, 2021 11:32   Subject: Re: Hillman Hall of Minerals and Gems
Had to delay till next month. We are picking out when now.
  Topic: Price changes
Tom Mazanec

Replies: 16
Views: 2301

PostForum: Off-Topic and Introductions   Posted: Apr 25, 2021 12:47   Subject: Re: Price changes
TOM,
There were 2 (!) personally self-collected examples shown, both used only as examples.

One was from 0 cost - $2750 offered, the other was from 0 cost - $3000 offered.
In my arithme ...
  Topic: Price changes
Tom Mazanec

Replies: 16
Views: 2301

PostForum: Off-Topic and Introductions   Posted: Apr 25, 2021 11:07   Subject: Re: Price changes
Being that this website forum is part of a dealer's website, I am not sure your question is appropriate. However, I will answer it in a different sort of way.

The 2 attached photos are 2 of my bes ...
  Topic: Price changes
Tom Mazanec

Replies: 16
Views: 2301

PostForum: Off-Topic and Introductions   Posted: Apr 24, 2021 11:19   Subject: Price changes
My books sometimes give an idea of how much a particular gem or mineral would cost. However, they say prices are very prone to change.
What are the biggest changes of the last five or ten years?
  Topic: How does color treating "work"?
Tom Mazanec

Replies: 6
Views: 883

PostForum: Off-Topic and Introductions   Posted: Apr 24, 2021 06:25   Subject: How does color treating "work"?
I read you can change colors of gems by dyeing, heat or radiation. Dyeing I can understand, but how does heat or radiation change a stone's color? The heat cools off and the radiation dies out, and ne ...
  Topic: Hillman Hall of Minerals and Gems
Tom Mazanec

Replies: 9
Views: 1307

PostForum: Other Museums in USA   Posted: Apr 11, 2021 11:14   Subject: Re: Hillman Hall of Minerals and Gems
It is an excellent mineral museum. Enjoy it. But check before you go to make sure they are open!

We're going in mid-May. My cousin is handling all the details.
  Topic: Hillman Hall of Minerals and Gems
Tom Mazanec

Replies: 9
Views: 1307

PostForum: Other Museums in USA   Posted: Apr 11, 2021 07:26   Subject: Hillman Hall of Minerals and Gems
My cousin is taking me for a few days on a mini-vacation to Pittsburgh. Researching, I came across this collection in their Carnegie Museum of Natural History.
Anybody have any tips or reviews on it ...
  Topic: Raman Spectroscopes
Tom Mazanec

Replies: 5
Views: 1336

PostForum: Off-Topic and Introductions   Posted: Mar 10, 2021 18:18   Subject: Re: Raman Spectroscopes
Another promising technology mentioned on page 274 is infrared spectroscopy. Any of you use that?
  Topic: Raman Spectroscopes
Tom Mazanec

Replies: 5
Views: 1336

PostForum: Off-Topic and Introductions   Posted: Mar 09, 2021 16:29   Subject: Re: Raman Spectroscopes
Most of the online ads say "Contact us for price", but I saw a used one for $6500.
  Topic: Raman Spectroscopes
Tom Mazanec

Replies: 5
Views: 1336

PostForum: Off-Topic and Introductions   Posted: Mar 09, 2021 13:47   Subject: Raman Spectroscopes
My 2016 Gem Identification Made Easy (2016) on page 34 says

While it lacks portability and is not yet an affordable instrument (currently selling at approximately $12,000) for most of the readers o ...
  Topic: Beautiful durable and...common?
Tom Mazanec

Replies: 8
Views: 2807

PostForum: Off-Topic and Introductions   Posted: Mar 03, 2021 09:40   Subject: Re: Beautiful durable and...common?
SteveB:
Just reading this and it occurred to me -
Why would any country print six or fewer stamps of a specific kind?
  Topic: A gemstone Christmas
Tom Mazanec

Replies: 1
Views: 1808

PostForum: Off-Topic and Introductions   Posted: Mar 03, 2021 09:30   Subject: Re: A gemstone Christmas
Ordered myself a couple more for my birthday (March 5):
Gem Identification Made Easy (6th Edition): A Hands-On Guide to More Confident Buying & Selling
Matlins and Bonanno

The Jeweler's Direc ...
  Topic: Sometimes fluorescent
Tom Mazanec

Replies: 5
Views: 1440

PostForum: Off-Topic and Introductions   Posted: Feb 27, 2021 08:28   Subject: Sometimes fluorescent
Sometimes I read things like "Mazanecite is sometimes fluorescent."
"Sometimes"?
What would make one specimen of a chemical substance fluorescent when another specimen with the e ...
  Topic: New locations
Tom Mazanec

Replies: 7
Views: 2084

PostForum: Off-Topic and Introductions   Posted: Feb 07, 2021 09:43   Subject: New locations
Are we still getting new mineral locations? Or have they all been pretty much found? What are the big 21st Century discoveries, if any?
  Topic: Heat changes some minerals - how?
Tom Mazanec

Replies: 11
Views: 2217

PostForum: Off-Topic and Introductions   Posted: Jan 29, 2021 10:32   Subject: Heat changes some minerals - how?
How does heat change a mineral? It should not change the chemical composition (unless the stuff burns). If it is temperature that does it you would expect the change to revert when it cools.
What hap ...
  Topic: Chromium in jewels
Tom Mazanec

Replies: 3
Views: 1635

PostForum: Off-Topic and Introductions   Posted: Jan 25, 2021 12:57   Subject: Chromium in jewels
Why does the same element (chromium) color beryl green (emerald) and corundum red (ruby)?
  Topic: Synthetic rubies and shortwave UV
Tom Mazanec

Replies: 2
Views: 1368

PostForum: Off-Topic and Introductions   Posted: Jan 19, 2021 21:08   Subject: Synthetic rubies and shortwave UV
Gemstones of the World Walter Schumann 5th ed. page 101
It says that synthetic, in contrast to natural rubies, can be recognized by the fact that they transmit shortwave UV.
Why? Or rather, how? Syn ...
  Topic: Beautiful durable and...common?
Tom Mazanec

Replies: 8
Views: 2807

PostForum: Off-Topic and Introductions   Posted: Jan 12, 2021 13:50   Subject: Beautiful durable and...common?
My gem books say gem minerals must be beautiful, durable and rare. Are there any "gemstones" which are common? They would still make nice, cheap costume jewelry.
 
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