Glass Gemstones: The Good, The Bad and the Pretty
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- Опубліковано 15 бер 2022
- Glass is known to many as a big fake. How do we know glass when we see it, and how can we test it to be sure? In this episode we'll find out and explore some types of glass that are worth your attention.
For those of you interested in historical glass such as Roman glass with over 1,000 years of history mined/recovered in Israel please contact Gil Yuda. Instagram may be the most direct route: @gilyuda
For those looking for rough roman glass to facet with your own designs, then connect with the pillar of the rough community: Joe Henley. Also available on instagram via @joe_henley_rough
Otherwise~ welcome to visit me at gemshepherd.com
Explore more about investing in gemstones and gemology and contact me directly.
ooooo I like that Roman glass!!! history, color, rarity, wow whats not to love about it!
It's great stuff isn't it?
I adore Roman glass, and Gil is indeed one of my favorite sources! 💚
Very interesting. I especially liked the comparison of the tsavorite vs glass comparison. I also am fascinated by Roman glass. I’m going to look at my collection of vintage costume jewelry to see if I can find some rounding. Thanks for the good info!
The hunt is on~
Peter thank you for a good tutorial, lots of good and useful information. I recently cut a few pieces of sea glass of an interesting color, I also prepared a few pieces of Roman glass
My pleasure, and thank you for your kind words. Sea glass is another interesting material. Its just tough to distinguish sea glass from other historical glasses without the right inclusions. I hear there are some interesting minerals that have gotten into the Roman glass that can enable us to verify it as historical glass vs a modern simulant.
Great video! I find glass an interesting collectible--uranium treated glass especially intriguing. I've only dealt with glass in determining if it's a genuine gemstone or not, mostly with a polariscope. This though is a nice insight to its variety. Thanks for the info! :)
Thanks Aster~ I do love the polariscope aswell. Fast and definite information, without having to get out that stinky toxic R.I. liquid. Cheers
So i identified my peridot, garnet, and aquarimarine by magnetism on a raft. I identified the topaz and cz by specific gravity. Also the cz had a ton of luster and could be scratched (but not super easily). Actually the pink cz dragged on the raft too which helped me narrow it down. None of the other colors did. I think that helped me eliminate synthetic corrundum and moissanite but i forgot exactly. The chart was giant. Cheap diamond tester came back negative which eliminated the synthetic diamond claim. Looking through the loupe it had wear in the facets although they were pretty sharp still. Also did a line test and it looked identical to my known cz. identified the pearls by rubbing against my tooth. Did all the quartzes by specific gravity. Also i think i can tell double refraction with the loupe but im not totally confident but it did look like the topaz was doubly refractive. I wanna say and quartz and cz was not or a lot less but yea i forgot that too lol. I also noticed streaking i think its called, in some of them which told me it was a real crystal and not glass. I have a 60x loupe which actually is kinda useful but hard to use. Tried to match inclusions but they all look similar to me still. Rubies were identified with a black light. Are you hiring? Lol
My understanding of the term "paste" is as follows.
The word "paste" comes from the old french word "paste" that means..., wait for it... "paste"! (Yes, I know 😁)
Or "dough".
It refers to a step in the fabrication of glass and cristal where the heated mass has a pasty consistency.
Furthermore, the process of crushing glass to a fine powder whilst adding pigments and chemicals that improve appearance produces what is called "pâte de verre" by the French (who are clearly an inventive lot when it comes to naming things 😄)
The ^ replaces the "s" that wasn't pronounced anymore ("verre" means "glass")
"Pâte de verre" = "Glass paste"
French terminology is relevant because it is in France that certain glass and cristal technics were invented and refined from the 18th century: glass paste became greatly popular as an alternative to gemstones, even at court.
Bonus point: pastry and pasta are also named after this word "paste" which here means "dough"
ah ~ thanks for the education.
Best explanation to find out the if its glass or not👍❤
Thanks very much Joandjun ~ glad it is helpful.
Very informative, thanks! Hope life is good there!! Blessings
Thanks Davidˆ2 ~ We keep on keeping on. May your way also be blessed.
Thanks for yet another informative video!
My pleasure, George-David
Awesomeness
A great series from yourself would also be you, taking the gem-a and gia courses and reviewing them. You deserve a wider audience
Thanks very much ~ the FGA program does hold some interest for me, though carving out 6-8 months for the program isn't on the agenda just this moment. I have so many things I want to do.
" This don't spark joy " , I couldn't tell you why but I laughed like hell when you said that. As a side note, I have a huge crush on you, a first for me in my 52 years. 😊 Subject change: I wonder how many people even know what schmuck means ?
Glad you enjoy my shameless banter. 🙏 ~ and the schmuck conversation is ongoing. There are some folks that want to take offense to it and others that think its banal yet amusing. Frankly it's a great case study in the ownership of meaning in language :D
I'm sure Mel Brooks would agree. Schmuck is a great word. Did you teach your english students that little gem of a word. Lol. Here's hoping you always have fair winds and following seas in your life.
(Smooth sailing)
Hello from Florida
Cheers from BKK Christoph~
Old jewellery can be wonderful.
They early ones with glass already were made 3000 years ago or more older.
The fancy coloured and or carmé slyle are a lust for the eyes.
Even the Egyptian farao's did admire and wear jewellery with natural desert glass.
Its not always men made glass.
True - some of the north African desert glass is really cool aswell. Why not have gems made by lightning~!
Hey Peter, I’ve missed you. I was only wondering the other day, humm, Peter hasn’t posted in a while and was going to send you a message.
Anyway, nice to see you are well. Great video on glass. Yea so long as it’s sold as glass, I’m fine with it. Actually my friend sent me over some Obsidian in its matrix a few years ago and I put it in my Terrarium with some Air plants, looks amazing in its matrix. It’s valuable to me as my friend actually dug it out from Arizona.
Thanks for sharing some more great content Peter. Rog. 😀👍
Hi Roger~ thanks for your thoughtfulness. Stones on matrix are incredible to me. I've got a hankering for some aquamarine on mica that I saw a while ago. I just want it on my shelf so that I can marvel at it XD
@@GemologyforSchmucks - Aquamarine in Mica, just get it Peter. I’ve seen some beautiful examples displaying the tall Hexagonal crystal structure. A friend of mine who is a lapidary has one, he keeps it in his cabinet, says it’s worth more to the beholder than a cut stone. Great to hear back from you, as always. Big love from Wales. Rog. 😀
Great video Peter thanks, I'm going to be taking my diamonds and diamond grading exam on the 22nd of April, to earn my diamonds and diamond grading certificate, then I have to save up for the lab class to earn my Graduate Diamonds Diploma x
Best of luck to you Annie~
@@GemologyforSchmucks thanks Peter ❤
At some point can you show the difference between the sharp facets on a diamond vs a softer gem while magnified or under a loupe please?
Another great video , how is the cutting going ?
Thanks Pepsi~ Cutting is coming along. Editing has been particularly laborious lately, so videos have been on the back burner. There will be more though, never fear~!
Actually, lead can leach out of glass, but it takes time. Storing alcohol in a leaded glass decanter long-term is generally frowned upon. Putting it in a decanter for a few hours for a party or something should be alright.
I believe I did read something similar about the lead glass leaching situation. One reasonable solution: hold enough solid dinner parties so that the liquor doesn't linger in the decanter.
@@GemologyforSchmucks I like how you think. 👍
Are there any gems that you could partially identify by placing them in water? I know opal. Maybe there are others with a refractive index close? I like identifying gems with things you can acquire for cheap.
Can you please make a video on zultanite crystal
Yea i was watching another channel with a PhD lady in antique jewelry and she said a lot of older costume jewelry is still kinda valuable and most people assume its junk. Life is better with knowledge. Whats your favorite stone? I think mine is opal or ammolite so far. I think star sapphires are pretty cool too.
Im a huge fan of star sapphires, and I can't stop looking at spessartite. Hard to pick a "favourite" though. My favourites fluctuate wildly
I like Ammolite for its colours, blue being rarer as it’s thinner, it’s one of the most beautiful organic gemstones. I do marvel at star Sapphires, I know Peter has covered these in the past.
Darn, i was hoping that there was at least one easy tell tale attribute (for an amateur) that would immediately reveal that something is glass...
Id suggest getting real comfortable with a loupe and see as much as you can. Your eye will start to grab certain features, and then you might start saying "this IS easy."
u missed Lybian Desert glass in the discussion
There are many types of glasses, both historical man-made and natural that did not make it into this short video, yes. Perhaps my friend Gil Yuda would have something to say on the topic.
Have you ever heard of the diamond simulant called "luster"? What is it? Does it have any value? I recently learned about the 2 most common ways a synthetic diamond is created which are; high temperature high pressure, and chemical vapor disposition. It helps me remember to comment what i know.
C.V.D. is a coating as far as I know, usually Titanium.
@@rogerhargreaves2272 interesting!
From what i've heard, CVD can be a coating on diamond, yes but many of the synthetics that are shattering the diamond market are purely CVD melee. Because these pieces are often so clean as to be unidentifiable by a gemologist with standard equipment, it has raised the cost of verifying natural vs synthetic diamonds substantially. Particularly when you consider how much of the diamond market is done in tiny tiny diamonds for micro-pave etc, this is a massive problem. Not a problem for me though as I vastly prefer coloured stones.
Ah glass. Sometimes you come across some antique costume jewelry that is so nice it's a shame that the setting work outshines the "stones". Your necklace in this vid must have a story - give!
Agreed on the work vs stones thing. This is part of why I encourage people to buy the stones they love when they have the chance. We can't always find a similar stone, but you can usually at least get in a cue for a goldsmith to do custom work.
This necklace is a ceramic one I picked up in China over a decade ago. Not much of a story about the necklace in particular, aside from the fact that I like asymmetry and traditional designs reasserting themselves in modern objects.
Can someone tell me anything about my "quartz glass banger" I use for dabbing cannabis oil? I just assumed they just called it that, but is there quartz-glass compounds used out there? I torch it to 850+ degrees for use, so they say its "tempered" which I've never considered either. I am going Google but still any info?
Quartz and many types of glass are chemically almost the same thing. It took a long time to actually develop a process that could make synthetic quartz, because if you just put those components through a blow-torch like with corundum and spinel... it just becomes glass. It doesn't form a crystalline structure like the other minerals that can be formed in the melt processes like flame fusion etc. My ignorant assumption in this situation is that they're calling it quartz glass because maybe they started with some cheap crystals and melted them for marketing purposes. I have no idea... i'm grasping at straws.
Glassblower here - quartz glass is just that - glass made of pure silica, without any other additives. Other glasses have all sorts of additives to make them melt at lower temps and be more workable, eg boron in borosilicate (which the rest of your pipe is made from).
To what degree can you round up when measuring carats? I have a milligram scale
If you're not specifically using a calibrated carat scale, then I would not advise rounding weights. For diamonds and coloured stones, the rules are slightly different. A 3 decimal place sensitive scale can be rounded up for 5 and above in the 3rd decimal place with coloured stones (0.996ct =1ct), and diamonds will need the 3rd to be a 9 in order to round up, as I've last heard (0.99962= 1).
@@GemologyforSchmucks where else could i possibly get that information. Thank you!
@@idonthaveaname42 GIA has a wealth of public and freely available articles, as do other major labs
Do u make jewelry? What is your website?
Hi Jennifer~ I do make jewelry, though currently its all private collection (mostly mine XD) as i'm still in the skill building phase. My website (for gemology) however is gemshepherd.com ~ feel free to reach out if you're interested in stones. For jewelry however, i'll have to ask you to be patient for a little longer XD
Thanks for the comment~
I think my color change diaspore is glass...
You saw my recent video on the phone polariscope? You'll have a decent indicator soon...
ua-cam.com/video/ZKja_p4ROs8/v-deo.htmlsi=Rq2UjTl2LHiC5Af7
@@GemologyforSchmucks that was the exact indicator that made me suspicious. Along with being loupe clean, other than what I'm now confident are flow lines...
imo, cutting the glass gemstones is not worth it. The facets will chipped and fade away easily. Cabs still okay, the polish will dull but it can be repolished much easier