GEMS AND GEMOLOGY

Gemology has been a fascinating hobby of mine for over 20 years, reading up “Gemstones of the World” by Walter Schumann, attending practical classes on coloured gemstones, and visiting gem mining areas. I acquired some pieces, both priced and less well known, of various colours, shapes and cuts from gem-producing areas like Burma,Sri Lanka, Thailand, Cambodia etc. These have since grown to quite a collection.

Among the 63 gems species are: traditional gemstones - corundum(sapphire,ruby), beryl (emerald,aquamarine), fancy diamond; and others - spinel, chrysoberyl(cat's eye,alexandrite), tanzanite, garnet(tsavorite, spessartite,), tourmaline(rubellite,indocolite), zircon, topaz, quartz(amethyst,citrine), chalcedony(agate,chrysoprase), feldspar(moonstone,labradorite), kyanite, peridot, kunsite, scapolite, flourite and many other lesser known gemstones. (view complete list on blog archive on the right with traditional gemstones at the bottom. click on types of interest to you.)

I'm now divesting my collection. An abbreviated description is provided below each photo, including price. Example 1: m2(size ref) tq(turquoise gem) ov(oval shape) plgnbl(pale greenish blue colour) afg ( Afghanistan country) 3.82 (carat weight) (18.7x8.5mm)(dimensions LxW) in mm) op (opaque clarity) 175 (USD 175 price) 10b30 N18(ref no and location). Example 2:"sa (type sapphire), ov(shape oval), dpbl(colour deep blue), af(origin Africa), 4.43(weight in carat), (11.3x10.2x4.6mm)dimension LxWxD, ec(clarity eyeclean), 1k(price US$1000)".

Personal viewing can be done for friends in Singapore.

Those outside Singapore, purchase can be secured via registered post upon payment in USD(or Singapore equivalent) via paypal, money/postal order, account transfer/cheque (Singapore) or other mutually agreed arrangement. Do have a look and contact me for any other details.

Happy viewing!

Monday, January 11, 2010

QUARTZ – ADVENTURINE, CHRYSOCOLLA, SAGENITE, DENDRITIC, TIGER’S EYE, PRASIOLITE

Quartz (after a Slavic word for “hard”) is the name give for the largest and most common family of minerals of the same chemical composition(SiO2) and similar physical properties. Their are subdivided in two sub-groups. The first, macrocrystalline quartz (crystals recognizable with the eye) includes varieties such as amethyst, citrine, ametrine, rock crystal, rose, smoky, lemon, green, blue and those mentioned in the title above.

Green Adventurine Quartz, rarely yellow orange. Metallic glittery appearance
g1 av prc gn af 41.57(29x24x7.8)si 200 10b44 L5
g1 av prc gn af 41.57(29x24x7.8)si 200 10b44 L5   
 

   g av ovc gn af 37.60(33x21x6.4)si 200 10b43 M4
g av ovc gn af 37.60(33x21x6.4)si 200 10b43 M4
         h av rnc gn af 10.30(17x5.1)tlu 75 0b44 M2
h av rnc gn af 10.30(17x5.1)tlu 75  0b44 M2
         l2 av rnc gn af 7.25(12.2x5.4)tlu 75 10b44 M7
l2 av rnc gn af 7.25(12.2x5.4)tlu 75 10b44 M7
   h1 av ov hno af 20.75(27x17x5.7)si 150 10b43 M4
h1 av ov hno af 20.75(27x17x5.7)si 150 10b43 M4

Greenblue Chrysocolla quartz – greasy vitreous lustre – intergrowth of chrysocolla with quartz
        l2 col tr mdgnbl 7.38(18.2x17.4x3.5)trl 200 10b48 M20  
l2 col tr mdgnbl 7.38(18.2x17.4x3.5)trl 200 10b48 M20
    l2a col ovfn gnbl 6.51(16.1x11.1x4.6)trl 200 10b48 M11
l2a col ovfn gnbl 6.51(16.1x11.1x4.6)trl 200 10b48 M11
          l col prfn mdgnbl 5.98(20.5x11.2x3.2)trl 200 10b48 M29
l col prfn mdgnbl 5.98(20.5x11.2x3.2)trl 200 10b48 M29
    m1 col prfn gnbl 4.60(16.7x12x3)trl 150 10b48 M19
m1 col prfn gnbl 4.60(16.7x12x3)trl 150 10b48 M19
  h2 col bg bl mx 17.25(26x11.2x5.3)op 250 10b48 L4 h2 col bg bl mx 17.25(26x11.2x5.3)op 250 10b48 L4

Sagenite and Dendritic (rutilated) Quartz – needle-like or branch-like inclusions - popularly called Venus-hair stone.
e1 sag ovc w-rdn br 76.4(37x25x10)tp 300 10b8 M20 e1 sag ovc w-rdn br 76.4(37x25x10)tp 300 10b8 M20     
g1b sag ovc w-rdn br 40.60(28x18x9.8) 250 10b9 M13
g1b sag ovc w-rdn br 40.60(28x18x9.8) 250 10b9 M13
   
e1a qt ovc seascape 76(34.7x22.4x13.6)tp 300 10b20 M33
  e1b sag cuc w-gnn 67.69(25.7x22.9x14.9)tp 300 wb2 M51
e1b sag cuc w-gnn 67.69(25.7x22.9x14.9)tp 300 wb2 M51
     
g1 dn ovc bk-gy ma 45.50(29x22x9)ec 250 M15
  g1a sag trc w-gnn br 45.29(41.6x22.7x7.6)tp 250 10b6 M20
g1a sag trc w-gnn br 45.29(41.6x22.7x7.6)tp 250 10b6 M20
     g sag trc y-bnn 30.02(21.7x21.7x11.2)tp 300 10b7 E64
g sag trc y-bnn 30.02(21.7x21.7x11.2)tp 300 10b7 E64
g dn em bn ma 34.50(25x16x10)ec 100 C6
  h1 dn fn w-rdn 22.80(25.6x18.9x10.6)tp 300 10b10 M43
h1 dn fn w-rdn 22.80(25.6x18.9x10.6)tp 300 10b10 M43
  h2 dn pr w-bnfrn 15.55(22.3x13.8x9.8)tp 250 10b10 M31
h2 dn pr w-bnfrn 15.55(22.3x13.8x9.8)tp 250 10b10 M31
      h2 sag em w-gnn 15.25(18x14x7.5)tp 250 M24
h2 sag em w-gnn 15.25(18x14x7.5)tp 250 M24
     h5 sag trc w-bkn br 11.02(17.4x15.5x6.3)tl 150 10b10 C8
h5 sag trc w-bkn br 11.02(17.4x15.5x6.3)tl 150 10b10 C8
        h3 sag ovc w-rdn af 13.98(20.2x13.8x7.1)tpu 140 10b9 C2
h5 sag trc w-bkn br 11.02(17.4x15.5x6.3)tl 150 10b10 C8
      h4 sag ovc w-yn af 12.74(17.8x13.4x7.5)u 120 10b49 C9
h4 sag ovc w-yn af 12.74(17.8x13.4x7.5)u 120 10b49 C9

Tiger’s eye – silky lustre, chatoyancy (cat’s eye) due to fibrous structure with crocidolite (blue asbestos) inclusions
e qt tge tpbg ybn 56.96(32.7x24.3x8.5) 300 10b3 M27   
e qt tge tpbg ybn 56.96(32.7x24.3x8.5) 300 10b3 M27 
     z g1 qt tge tpbg ybn 42.55(28.4x23.2x7.9) 300 10b4 M33 gft
z g1 qt tge tpbg ybn 42.55(28.4x23.2x7.9) 300 10b4 M33 sold
      h1 qt tge ovc mltbn 23.80(26x21x5.3)op 100 10b5 C4
h1 qt tge ovc mltbn 23.80(26x21x5.3)op 100 10b5 C4
         h qt tge ovc gbn 11.80(17x15x5.9)op 100 10b5 C5
h qt tge ovc gbn 11.80(17x15x5.9)op 100 10b5 C5
               l1 qt tge ov y 8.65(16.3x12.2x6.4) 120 10b5 M12
l1 qt tge ov y 8.65(16.3x12.2x6.4) 120 10b5 M12
          
           m1 qt tge ov bng 4.0(12.2x10.3x5.2)c 80 10b5 C8
m1 qt tge ov bng 4.0(12.2x10.3x5.2)c 80 10b5 C8
                s qt tge ov bl pr 2.45(8x6) 40 10b5 C4
s qt tge ov bl 2.45(8x6) 40 10b5 C4
              s qt tge ov rd-pp pr 2.33(8x6) 10b5 40 C4
s qt tge ov rd-pp 2.33(8x6) 10b5 40 C4

Yellow-green Prasiolite – vitreous lustre, some bi-colour with brown striated zoning
   h1 pra br ygn br 21(18.6x13.8)ec 210 9b46 L21 
h1 pra br ygn br 21(18.6x13.8)ec 210 9b46 L21
    h pra ov ygn 10.17(17.9x13.1x9.2)ec 200 9b46 T32
h pra ov ygn 10.17(17.9x13.1x9.2)ec 200 9b46 T32
    h2 bi-pra em ygn-gy 15.14(19.7x12.7x7.8)ec 150 9b46 M19
h2 bi-pra em ygn-gy 15.14(19.7x12.7x7.8)ec 150 9b46 M19
       l1 bi-pra em y-bn br 8.92(13.8x12x7.2)c 90 9b46 C3
l1 bi-pra em y-bn br 8.92(13.8x12x7.2)c 90 9b46 C3
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