SHOW: Rings 296


Title:      Ring.
General:    This is a pair of Sterling Silver Wedding Rings, set with
            Citrines.

Material:   Sterling Silver.
Gem:        Citrine.
Method:     Cast.
Finish:     Polished
Mechanics:  Bezel set.
Designer:   W.van Heeckeren.
Craftsman:  W.van Heeckeren.

Availability: This pair is not for sale.

Price:      AUS $ 250.00 each.










STERLING SILVER.


        STERLING SILVER is a binary Silver alloy consisting of:
                        925 parts/1000 Pure Silver and
                        75 parts/1000 Pure Copper.
 Annealing temperature: 750 degrees Celsius.
   Melting Temperature: 950 degrees Celsius.

                                                    Wal.













BEZEL SETTING.


        Bezel Setting is done by making a sheet metal surround (the
                bezel) for the stone.  Once the jewelry has been finished
                the stone is then set.  In setting the stone, the stone is
                placed in the bezel, and the bezel is shrunk in around the
                stone, by pushing it in little by little evenly around the
                circumference, until the metal seals tight against the
                stone. As a finishing touch a flat graver is used to bright
                cut the edge of the bezel at right angles to the plane of
                the bezel.

                                                    Wal.









CASTING.


            CASTING is a method by which moulten metal is poured into a mold
                    in order to achieve the desired shape.  In the "Lost
                    Wax" method, an accurate wax model is made.  The wax
                    model is invested (put in a chrystobalite plaster),
                    after the investment has set, the wax is burned out in
                    a Kiln.  This leaves a negative cavity into which the
                    moulten metal may be poured.

                                                    Wal.











Technical Data for CITRINE.


name:                   CITRINE (quartz group)
colour:                 Light yellow to gold-brown
colour of streak:       White
mohs hardness:          7
specific gravity:       2.65
cleavage:               None
fracture:               Conchoidal, very brittle
crystal system:         Hexagonal (trigonal);hexagonal prisms
chemical composition:   silicon dioxide
transparency:           Transparent
refractive index:       1.544-1.553
double refraction:      +0.009
dispersion:             0.013
pleochroism:            Natural: Weak; yellow-light yellow. Heat-treated: none
absorption spectrum:    Not usable
fluorescence:           None




Technical Data for QUARTZ.


QUARTZ:  Minerals of the same or similar chemcial composition are included
            under  the  single  group  of  Quartz  (SiO2  resp.  SiO2.nH2O)
            silicon dioxide:

Macrocrystalline   quartz  includes  AMETHYST,  AVENTURINE,  ROCK  CRYSTAL,
        CITRINE,  PRASE,  HAWK'S  EYE, QUARTZ CAT'S EYE, SMOKY QUARTZ, ROSE
        QUARTZ and TIGER'S EYE.

Microcrystalline quartz includes CHALCEDONY GROUP - AGATE, FOSSILISED WOOD,
        CHROPRASE,  HELIOTROPE,  JASPER,  CORNELIAN,  MOSS  AGATE, ONYX and
        SARD.

Amorphous  quartz includes OPAL GROUP - PRECIOUS OPAL, FIRE OPAL and common
        opal.