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Jennifer

Classifieds Related Question, Sell GPX As Combo Or Alone

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Jen, in my experience (both buying and selling used.) First follow Steve's advise and check sold prices on places like ebay, price you basic unit in that ball park. If you want to sell the options along with it, add up the total paid for them and then add half of that to the price of the base unit. I'm not real sure about doing an OBO, sometimes that can turn into a bidding war where you really come up well, other times most everybody waits to see how cheep they can get it for. I think it depends on the number up for sale and the demand of the market.

Mike

 

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I sold my 5000 with all coils and accessories to someone on craigslist. I got a fair market price for it. I also included a full day of training with it, and actually got several inquiries even after sold. Also you will save listing fees from ebay and paypal if you sell on the forums, or craigslist.

Dave

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Thank you all for your input, my GPX was sold to a fellow board member from southern Arizona.... 

thx guys

Jen

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  • Similar Content

    • By Mike Hillis
      Ok.  I got the individual tables posted so with all this information you should be able to identify both the type and weight of any rock you might find in a jewelry item.   I got all this information from a gentleman who went by the name, 'Pawnbroker _Bob' on Tom Dankowski's site.  Its been a long time, several years, since Pawnbroker _Bob has posted and I haven't been able to get a hold of him for permission to repost on this forum so I am going to link his Forum post here, along with all the table posts I've made so you can find this stuff in one place when you need it.
      I'll just tell you that its pretty cool to id and calculate your own gem stones, and speak with a little bit of knowledge when you are showing them or trying to sell them.
      Start with Pawnbroker _Bobs post and then reflect on the tables.  I would encourage you to save this info into your own personal libraries.
      http://www.dankowskidetectors.com/discussions/read.php?2,24105,24105#msg-24105
      Genstone Weight Conversion Chart
      Gemstone Identification
      Gemstone Weight Calculation Formulas
      Gemstone and Other Compounds Specific Gravity List
      and lastly, some more of Pawnbroker _Bob's posts around selling gems.  The thread is not long and he is the expert.  

      http://www.dankowskidetectors.com/discussions/read.php?2,23695,23791#msg-23791
      There you go.  All I know on the subject I got from someone in the know.  All in one place.
      HH
      Mike
    • By Mike Hillis
      Specific gravity list.
      Compound..............Avg sg.

      Copal...............1.06

      Amber...............1.08

      Bakelite............1.26

      Jet.................1.30 -1.35

      Tortoiseshell.......1.30

      Erinoid.............1.33

      Celluloid...........1.38

      Vegetable Ivory.....1.40

      Ivory...............1.80

       

       
      Kurnakovite.........1.86

      Gaylussite..........1.99

      Ulexite.............1.95

      Meerscham...........2.00

      Bone................2.00

      Fire Opal...........2.00

      Opal................2.10

      Chrysocolla.........2.20

      Stichtite...........2.2

      Silica Glass........2.21

      Natrolite...........2.225

      Sodalite............2.13 -2.29

      Alabaster...........2.3 -2.33

      Obsidian............2.3 -2.6

      Apophyllite.........2.3 -2.5

      Thomsonite..........2.35

      Hambergite..........2.35

      Petalite............2.39

      Mouldavite..........2.35

      Obsidian............2.35

      Tugtupite...........2.37 -2.57

      Hauynite............2.4

      Cancrinite..........2.45

      Colemanite..........2.42

      Leucite.............2.47

       

       
      Pseudophite.........2.55

      Howlite.............2.53 -2.59

      Veriscite...........2.55

      Elaeolite...........2.55 -2.65

      Amazonite...........2.56 -2.58

      Orthoclase..........2.56

      Moonstone...........2.57

      Sanidine............2.57

      Moss Agate..........2.58 -2.62

      Chrysoprase.........2.58 -2.64

      Iolite..............2.59

      Bowenite............2.60

      Agate...............2.60 -2.65

      Chalcedony..........2.60

      Vivianite...........2.65

      Peristerite.........2.61 -2.63

      Aventurine..(fsp)...2.62 -2.65

      Scapolite..(pink)...2.63

      Sunstone............2.64

      Quartz..............2.65

      Amethyst............2.63 -2.65

      Prasiolite..........2.65

      Citrine.............2.65

      Synth. Emerald......2.65

      Coral...............2.68

      Aquamarine..........2.69

       

       
      Beryl (yellow)......2.69

      Labradorite.........2.69

      Pseudophite.........2.70

      Onyx................2.70

      Augelite............2.70

      Tiger eye...........2.64 -2.71

      Emerald.............2.71

      Labradorite.........2.70

      Aquamarine..........2.67 -2.71

      Scapolite...........2.70

      Calcite.............2.71

      Pearl (natural).....2.71

      Pearl (cultured)....2.75

      Talc................2.75

      Turquoise...........2.80

      Serpentine..........2.4 -2.8

      Steatite............2.7 -2.8

      Lapis Lazuli........2.80


       
      Beryllonite.........2.82

      Jasper..............2.58 -2.91

      Conch Pearl.........2.85

      Prehnite............2.87

      Verdite.............2.90

      Pollucite...........2.92

      Argonite............2.94

       

       
      Dolomite............2.85 -2.95

      Anhydrite...........2.90 -2.99

      Datolite............2.95

      Phenakite...........2.96

      Nephrite............2.96

      Brazilianite........2.99

      Nephrite............2.90 -3.04

      Danburite...........3.00 -3.07

      Tremolite...........2.90 -3.1

      Magnesite...........3.00 -3.12

      Andalusite..........3.12 -3.18

      Amblygonite.........3.03

      Tourmaline..........3.02 -3.26

      Lazulite............3.09

      Euclase.............3.10

      Zoisite.............3.10

      Andalusite..........3.15

      Kunzite.............3.16 -3.2

      Hiddenite...........3.16 -3.2

      Carborundum.........3.17

      Fluorite............3.18

      Spodumene...........3.18

      Apatite.............3.21

      Fibrolite...........3.25

      Smaragdite..........3.25

      Sillimanite.........3.25

       

       
      Enstatite...........3.27

      Axinite.............3.28

      Ekanite.............3.28

      Tanzanite...........3.28 -3.35

      Diopside............3.29

      Dioptase............3.30

      Kornerupine.........3.32

      Jadeite.............3.34

      Peridot.............3.34

      Purpurite...........3.35

      Zoisite (blue)......3.34

      Idocrase............3.38

      Rhodizite...........3.40

      Epidote.............3.45

      Dumortierite........3.26 -3.41

      Sinhalite...........3.48

      Hypersthene.........3.45

      Hemimorphite........3.45

      Grossular (massive).3.50

      Diamond.............3.52

      Sphene..............3.53

      Topaz (yellow)......3.53

      Topaz (white).......3.56

      Periclase (synth)...3.59

      Gahnite.............3.58 -3.98

       

       
      Rhodonite...........3.60

      Rhodochrosite.......3.60

      Spinel..............3.60

      Grossular...........3.64

      Benitoite...........3.67

      Taaffeite...........3.61

      Spinel (synth)......3.63

      Hessonite...........3.65

      Barytocalcite.......3.66

      Benitoite...........3.67

      Kyanite.............3.68

      Staurolite..........3.70

      Azurite.............3.80

      Pyrope..............3.70

      Chrysoberyl.........3.71

      Alexandrite.........3.70 -3.73

      Staurolite..........3.75

      Uvarovite...........3.77

      Malachite...........3.80

      Pleonaste...........3.80

      Demantoid...........3.82 -3.85

      Chalybite...........3.85

      Periclass...........3.80

      Anatase.............3.88

      Gahnospinel.........3.97

      Celestite...........3.97 -4.00

       

       
      Corundum............3.96 -4.01

      Sapphire............3.99 -4.00

      Ruby................3.97 -4.08

      Painite.............4.01

      Willemite...........4.03

      Sphalerite (blend)..4.09

      Glass...............3.15 -4.20

      Zircon (green)......4.50

      Almandine...........4.97

      Spessartine.........4.16

      Chalcopyrite........4.20

      Rutile (synth)......4.25

      Witherite...........4.27 -4.35

      Smithsonite.........4.35

      Barite..............4.50

      YAG.................4.60

      Zircon (blue,white).4.69

      Chromite............4.1 -4.9

      Pyrite..............5.10

      Hematite............5.05

      Strontium Titanate..5.13

      Proustite...........5.57 -5.64

      Cubic Zirconia......5.6-5.9

      Zincite.............5.66

      Crocoite............5.90 -6.1

    • By Mike Hillis
       
      Hereunder the standard formula


       
      Round faceted stones: Diameter squared x depth x S.G. x .0018 = ct

      Oval faceted stones: Length x width x depth x S.G. x .0020 = ct

      Emerald cut faceted stones: Length x width x depth x S.G. x .0025 = ct

      Rectangular faceted stones: Length x width x depth x S.G. x .0026 = ct

      Square cut faceted stones: Length x width x depth x S.G. x .0023 = ct

      Marquise cut stones, (navette): Length x width x depth x S.G. x .0016 = ct

      Pear cut stones: Length x width x depth x S.G. x .0018 = ct

      Square cushions:

      Diameter squared x depth x S.G. x .0018 = ct

      Rectangular Cushions:

      Diameter squared x depth x S.G. x .0022 = ct


       
      Square step cut stones:

      Diameter squared x depth x S.G. x .0023 = ct

      Rectangular step cut stones: Length x width x depth x S.G. x .0025 = ct Cabochon cut stones:

      Length x width x depth x S.G. x .0027 = ct Average corner meas & belly meas for cushions,

      L&W for rectangles, etc..

    • By Mike Hillis
      Hi all, 
      This info was shared with me by Pawnbroker_Bob from the Tom Dankowski site in PM's back in 2012.  
      Gemstone Characteristics Table
      We have compiled a listing of the scientific characteristics of many different gemstones. This is a chart that displays at a glance the important information about each classification of gemstone and it's members. Enjoy!
      Gemstones
      This is a fairly comprehensive listing of gemstones with their specific gravity, Mohs hardness, index of refraction and gemstone family classification in alphabetical order. We color coded them to help differentiate between them (these are approximations and subject to error).
      Specific Gravity: Specific gravity is the number of times heavier a gemstone of any volume is than an equal volume of water; in other words, it is the ratio of the density of the gemstone to the density of water. For all gemstones listed in this table there is a scientifically determined specific gravity. You can use the specific gravity and a couple simple measurements to estimate the carat weight of a stone.
      Mohs Hardness: Hardness can be tested through scratching. A mineral can only be scratched by a harder substance. Therefore, a relative scale can be established to account for the differences in hardness simply by seeing which mineral scratches another. That is exactly what French mineralogist Friedrich Mohs proposed almost one hundred and seventy years ago. The Mohs Hardness Scale starting with talc at 1 being the softest and ending with diamond at 10 hardest, is universally used around the world as a way of distinguishing minerals. Simply put - the higher the number, the harder the mineral.
      Index of Refraction: All materials refract light, ie alter its angle. The amount by which light is refracted is an important feature of every gemstone. The measure of a material's refractivity is known as its index of refracton (R.I.). Without going too deeply into physics, light travels at different speeds through different media. When light passes from one medium to another, its path is altered (bent) and it is said to be diffracted.
      Gemstone Family Classification: The gemstones listed here show every color in the rainbow. Even with such variety of colors, patterns and shapes - they can be broken down into 16 different families based on their chemical composition.

    • By Mike Hillis
       If you are going to hunt jewelry you need to know how to size your stones.
      Gemstones Weight Conversion charts
      All Weights Are Approximate 1 MM = .03937 inch







    • By tvanwho
      I was going thru my junk and found a gold bracelet that I had always thought was gold plate cause it was mostly brown with some yellow underneath? On closer examination, the clasp is clearly marked 14 K underneath by where the chain attaches and it does feel heavy. I got this ages ago with my Tesoro Lobo, before I had a metered machine.Just tested it with my MXT and 6 x 9 coil and it reads VDI 26-30, Pulltab/Ring on Coin mode and in Prospect mode,it reads 10% iron id which sure sounds like nonferrous to me...Does 14 K gold really corrode like this? How do I clean it up? Maybe I better take it to my coin dealer and see what he will give me ? It is about 8 inches long, 1/4 inch wide and 1/16 inch thick. Photos attached,taken with my new used Canon SX 50.
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