ronk15a

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Everything posted by ronk15a

  1. ronk15a

    52.56Ct Conundrum Not To Be Confused With Corundum

    Fulvio Bianconi Con Macchie vase Venini Italy, c. 1950 glass with abstract internal decoration and lightly iridized surface 7.25 dia x 8.75 h inches Signed with three-line acid stamp: [Venini Murano Italia]. Literature: Venini Glass: Catalogue 1921-2007, Deboni, fig. 224 Photo Credit: Wright, Chicago IL
  2. ronk15a

    52.56Ct Conundrum Not To Be Confused With Corundum

    As a dealer in old blown glass Tiffany, Loetz, Galle, Daum....I should have thought glass right off the bat. Not geological creations over billions/billions of years. DUH!
  3. ronk15a

    52.56Ct Conundrum Not To Be Confused With Corundum

    It appears you are correct. Thanks Davide. P.S. So just to clarify you believe this to be molded flint glass that is colored by iron particulate.
  4. ronk15a

    52.56Ct Conundrum Not To Be Confused With Corundum

    RI 1.517; dense flint glass "Ordinary bottle and window glasses have densities in the region of 2.5. That of lead crystal glass is approximately 3.1, of "densest flint"optical glass 7.2, and of ... Bubbles occurred during the pressing stage when air got inside the mold. Bubbles are a part of the making of Pressed Glass and are also considered acceptable. They do not signify an original piece or a reproduction as it can occur in any type of glass, depending on the quality of the glass maker and quality of the mold.
  5. Came across this stone...How did GIA grade this very good? GIA report number 2175689489
  6. IDK: But someone on eBay must have thought it was a Tiffany & CO: Ring & Diamond...Hence 95% of RAP (looks like the going rate on eBay these days) center...all else usually incl. ie setting/side stones when applicable.
  7. Actually I have seen a few T&C I/VVS....but nothing lower than I
  8. I agree with both of you. 1. The first eBay pic the mark looks correct: location, type face, size, and impression. The prongs do not. (Too Short, and stubby)! 2. I am almost positive that Tiffany & CO would not use a stone of these proportions. H/VS2 combo is probably the lowest level C/C. T&C usually goes E-G VVS-VS1 Surprising GIA grade I’m thinking this must of been borderline GIA Good.
  9. Selling for 95% RAP via eBay: Also note: I don't believe this is T&C (looks hideous) Your thoughts? http://www.ebay.com/itm/Tiffany-Platinum-Engagement-Ring-0-69ct-H-VS2-GIA-/262535566172?hash=item3d2056d35c%3Ag%3AIGEAAOSwepJXaanj&nma=true&si=2Ff7AnbmFeuX8uosq9DR%252FlA3stE%253D&orig_cvip=true&rt=nc&_trksid=p2047675.l2557
  10. Don't like CA, CH, PA, OR TD? How is this VG...
  11. It is my understanding that 99.9% percent of all emeralds are treated for clarity. Emerald treatments are typically done via oil, or resin. Mostly cedar wood oil (1.51), and or Canada balsam resin (1.55). The latter with a RI closer to that of emerald (1.56-1.60). My question is: Would you say that a good rule of thumb to determine the level of treatment within an emerald is if the stone looks eyes clean, but horribly included. It’s probably heavily treated. Vs. A stone that is eye clean, with minor inclusions based on 10X or microscope. That the latter would be hence, less treated….I hope this makes sense. If not I will clarify and re-write it differently! FWIW: All of the above Emerald treatments have tell-tale signs: including but not limited to: flash effect, typically blue or orange. Air bubbles, color inconsistencies sometimes located at the surface in patches, swath or patches of iridescence… What do you guys think of my emerald treatment ideology; being the stone is natural beryl (emerald variety). I recently tested a few known heavily treated emeralds with LWUV – for reactions consistent with cedar wood oil, and resin. The reactions were not very apparent….Is my device not strong enough? Are there different intensity of LWUV? I bought mine from an industrial supply house for under a few hundred dollars if I can recall correctly…you're thoughts!
  12. I have owned a Gem-A refractometer for quite some time now. (Have not used it in a long while) I was examining some colored stones the other day checking for RI and birefringence readings….Everything went OK but I tried to determine birefringence and could not get the lowest and highest reading, I rotated the lens 180 degrees. Nothing? I think the reason for that is I don’t have a polarizing filter….I have attached several images of my refractometer for your review: Can you guys tell me if I have a polarizing filter? Specifically I tried examining a peridot (amongst many others) which has a refractive index of 1.65 - 1.703 and is DR, with Birefringence of 0.036 which from my understanding is huge and very noticeable – like calcite, and coral. IMO: Either I’m doing something wrong, or I don’t have the polarizing filter…please help!
  13. ronk15a

    Gem-A Refractometer For Ri & Birefringence?

    Not a f***** clue. My bro P.S. I'm not much of a reader/follower of French 19C Poetry. LOL
  14. ronk15a

    Selling South Sea Pearl Necklace

    THOSE ARE NOT SOUTH SEA PEARLS. South Sea cultured pearls are exceptional quality pearls with a whitish, almost silver color. Much larger than the average pearl, the smoothness and roundness of these pearls are exceptional. These are the most rare and extraordinary pearls you'll find in jewelry. South Sea pearls come from the white-lipped variety of the pinctada maxima oyster. This oyster is much larger than the oysters that produce Akoya and Freshwater pearls, so the pearl that it produces is much larger as well. Because of the rarity and sensitivity of this type of oyster, cultivation of these pearls is much more difficult, making them more expensive. LUSTER Very High - High, bright reflections SURFACE Very Slightly Spotted - Few visible blemishes on some pearls NACRE Medium - Medium nacre coating SHAPE Slightly Off Round - Some pearls may be slightly less round and symmetrical COLOR White - With with rose and/or silver overtones
  15. ronk15a

    Gem-A Refractometer For Ri & Birefringence?

    My favorite excerpt: You dropped a hundred and fifty grand on a f----n' education you coulda' got for a dollar fifty in late charges at the public library.
  16. ronk15a

    Gem-A Refractometer For Ri & Birefringence?

    Will: You're a first year grad student. You just got finished readin' some Marxian historian -- Pete Garrison probably. You're gonna be convinced of that 'til next month when you get to James Lemon, and then you're gonna be talkin' about how the economies of Virginia and Pennsylvania were entrepreneurial and capitalist way back in 1740. That's gonna last until next year -- you're gonna be in here regurgitating Gordon Wood, talkin' about, you know, the Pre-revolutionary utopia and the capital-forming effects of military mobilization. Clark: Well, as a matter of fact, I won't, because Wood drastically underestimates the impact of social – Will: Wood drastically -- Wood 'drastically underestimates the impact of social distinctions predicated upon wealth, especially inherited wealth.' You got that from Vickers, 'Work in Essex County,' page 98, right? Yeah, I read that too. Were you gonna plagiarize the whole thing for us? Do you have any thoughts of your own on this matter? Or do you...is that your thing? You come into a bar. You read some obscure passage and then pretend...you pawn it off as your own idea just to impress some girls and embarrass my friend? See the sad thing about a guy like you is in 50 years you're gonna start doin' some thinkin' on your own and you're gonna come up with the fact that there are two certainties in life. One: don't do that. And two: You dropped a hundred and fifty grand on a f----n' education you coulda' got for a dollar fifty in late charges at the public library.
  17. ronk15a

    How Much Should I Pay For This Diamond

    Horrible GIA stone “based on numbers alone†circa 2016. (really bad) It’s colorless, yes! But will look dark, its 53 points but will look like 55-60, GIA calls it RBC buts it’s the furthest thing from...Optically Brilliant! CH & CA are horrific. SL, and LH are just as bad. P.S. It’s a really bad performing stone. I don’t know $500 bucks give or take! LOL
  18. ronk15a

    Gem-A Refractometer For Ri & Birefringence?

    OK -last post for this thread: ( I feel like I'm posting to myself) But its good exercise so F*** It Aquamarine: Some gems can carry inclusions of long, hollow rods, a trademark of the beryl family. Peridot: Strong DR, High birefringence, disk-like liquid and gas inclusions called lily pads. Citrine: Irregular color zoning common. Blue Topaz: 1.609 - 1.643, .008-.016 birefringence, 8 on MOHS Almandine Garnet: Garnet is attracted to neodymium magnets because it contains high concentrations of iron and/or manganese. Rhodolite Garnet: All garnets are SR (single refractive)
  19. ronk15a

    Gem-A Refractometer For Ri & Birefringence?

    The birefringence of the peridot was much easier to see than the citrine. The space between the 2 shadows was 3.5 or 4 lines there about. ie: .35-.40 (.36 is where it should have been) When it came to the citrine .9 is 90% of one little line. Very difficult to see the birefringence. P.S. I used a very powerful Maglite to illuminate the refractometer, instead of the 590nm yellow sodium light...The lines were much clearer. Some semi-precious stones I recently studied: Aguamarine Peridot Citrine Blue Topaz Almandine Garnet Rhodolite Garnet
  20. ronk15a

    Gem-A Refractometer For Ri & Birefringence?

    To determine the birefringenceof the stone: •Rotate the polaroid filter and note any shift in the shadow. •Take the readings of the stone from at least 4 different directions. •The difference between the maximum and minimum readings will give the birefringence of the stone. Any other tips....Please help?
  21. ronk15a

    Gem-A Refractometer For Ri & Birefringence?

    Just tried to get the Birefringence on a peridot and citrine, nothing happened? The RI stayed at 167, and 154.4 - What am I doing wrong?
  22. ronk15a

    Gem-A Refractometer For Ri & Birefringence?

    be back later with some updates...