US3534510A - Method of faceting gem stones - Google Patents

Method of faceting gem stones Download PDF

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Publication number
US3534510A
US3534510A US690916A US3534510DA US3534510A US 3534510 A US3534510 A US 3534510A US 690916 A US690916 A US 690916A US 3534510D A US3534510D A US 3534510DA US 3534510 A US3534510 A US 3534510A
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US
United States
Prior art keywords
polishing
pot
facets
stone
facet
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US690916A
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English (en)
Inventor
Alec Leibowitz
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Spectrum Diamonds Pty Ltd
Original Assignee
Spectrum Diamonds Pty Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Spectrum Diamonds Pty Ltd filed Critical Spectrum Diamonds Pty Ltd
Application granted granted Critical
Publication of US3534510A publication Critical patent/US3534510A/en
Anticipated expiration legal-status Critical
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Classifications

    • A—HUMAN NECESSITIES
    • A44—HABERDASHERY; JEWELLERY
    • A44C—PERSONAL ADORNMENTS, e.g. JEWELLERY; COINS
    • A44C17/00—Gems or the like
    • A44C17/001—Faceting gems
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B9/00—Machines or devices designed for grinding edges or bevels on work or for removing burrs; Accessories therefor
    • B24B9/02—Machines or devices designed for grinding edges or bevels on work or for removing burrs; Accessories therefor characterised by a special design with respect to properties of materials specific to articles to be ground
    • B24B9/06—Machines or devices designed for grinding edges or bevels on work or for removing burrs; Accessories therefor characterised by a special design with respect to properties of materials specific to articles to be ground of non-metallic inorganic material, e.g. stone, ceramics, porcelain
    • B24B9/16—Machines or devices designed for grinding edges or bevels on work or for removing burrs; Accessories therefor characterised by a special design with respect to properties of materials specific to articles to be ground of non-metallic inorganic material, e.g. stone, ceramics, porcelain of diamonds; of jewels or the like; Diamond grinders' dops; Dop holders or tongs
    • B24B9/161—Dops, dop holders

Definitions

  • This invention relates to faceting gem stones, particularly diamonds.
  • the invention consists in a method of faceting a bruted gem stone held in a pot provided with a surrounding guide ring comprising forming a plurality of facets by polishing on a polishing surface and terminating the polishing of each facet when'the ring contacts the polishing surface.
  • the invention also consists in a method of faceting a bruted gem stone held in a pot provided with a surrounding guide ring comprising forming a pair of touching facets common to the stone and pot by polishing on a polishing surface using the ring as a datum to terminate the polishing of each facet when the ring contacts the polishing surfaces in such a manner that the stone touching pot is provided with a sharp upper edge with a pro jecting peak between the facets, and then forming a further facet on the stone between the original facets by polishing away part of the original facets and using the projecting peak on the pot as a datum for terminating the polishing of said further facet when the peak contacts the polishing surface.
  • the invention also consists in a method of faceting a bruted gem stone held in a pot provided with a surrounding guide ring comprising forming a first series of touching facets around the stone and pot by polishing each facet on a polishing at the same polishing angle and terminating the polishing of each facet when the ring contacts the polishing surface whereby the pot is provided with a sharp stone touching upper edge with projecting peaks between its facets, then forming a second series of facets around the stone between its original facets removing portions of its original facets by polishing each further facet on a polishing surface at the same polishing angle, which is different to the polishing angle for the original series of facets and terminating the polishing of each further facet when one of the pot peaks joining a pair of original facets formed thereon contacts the polishing surface.
  • the invention still further consists in a gem stone faceted by a method as set out in any of the three preceding paragraphs.
  • FIGS. 1 and 2 are plan views of a diamond showing, respectively, the two stages of forming the 24 bottom 3,534,510 Patented Oct. 20, 1970 facets according to a conventional method of diamond polishing.
  • FIGS. 3 and 4 are plan views of a diamond held in a pot showing, respectively, the two stages of forming the 24 bottom facets according to the invention.
  • FIG. 5 is a sectional view of the front end of a holder with a gem carrying pot positioned therein ready for polishing by a method according to the invention.
  • the eight main facets 1 to 8 are formed by polishing with the stone held against a polishing surface at the required angle for these facets, these facets being formed alternately on opposite sides of the stone to obtain the correct balance.
  • first facet 1 would be polished then facet 5, then facet 7, then facet 3 and so on.
  • the sixteen halves 9 to 24 are polished (see FIG. 2) by steepening the angle of polishing about 1 degree to an angle suitable for the halves.
  • a bruted stone is first inserted into a conventional metal press pot a (see FIG. 5) of elongated pear shape with a stone holding cavity at its front end, the pot wall around the cavity being axially slit to provide a circumferential series of radially sprung stone-gripping fingers b, c, d.
  • the stone is gripped in the fingers around its girdle section so that the bottom of the stone projects from the pot as shown, for polishing.
  • the pot is preinserted in the front end of an elongate 2.
  • the holder provides a pot holding cavity 1 surrounded by an inner metal sleeve g, and insulating sleeve h and an outer metal sleeve 1'.
  • a bore through the length of the holder (not shown) communicates with the holding cavity 1, and a tight fitting axially slidable surrounding metal guide ring k is provided.
  • the ring k When the pot is gripped in the holder, it is necessary to set the ring k at a suitable lengthwise position along the holder so that its rim 1 can be used as a guide for terminating polishing of the 16 halves facets.
  • the subtended angled between an imaginary pair of lines X and Y would be about 98 degrees.
  • the position of the pot and holder is adjusted so that lines X and Y run through the edge portions m of the stone and the edge portions 11 of the pot.
  • the ring k is adjusted so that the outside of its rim 1 just touches lines X and Y.
  • This arrangement ensures that when the halves are polished on a polishing surface with the pot axis inclined to the surface at an angle 1/20L, portions m of the stone and n of the pot will be polished away before the ring k contacts the polishing surface.
  • a series of facets 1b to 16b will also be formed around the pot, and the pot will acquire a sharp scolloped stone touching edge with peaks A, A2, etc., between the facets (see FIG. 3). It is desirable that the pot and ring be initially relatively positioned so that during polishing a sufiicient amount of the pot will be removed to ensure that it is provided with a sharp stone touching scolloped upper edge.
  • the holder When the holder ring has been set, the holder is placed in the chuck of a polishing machine in which the chuck is carried at the end of a tang or bar mounted adjacent a horizontal polishing wheel for vertical movement towards and away from the wheel surface and horizontal reciprocation across the surface for zooting purposes.
  • the arm may be fulcrumed at its near end for pivotal vertical movements toward and away from the wheel surface, or it may be mounted in guides for translating vertical movements. In either case, it is preferred to provide a dashpot and mercury column control system for controlling movements of the arm onto the Wheel surface.
  • the chuck is mounted for rotational movement about its axis so that different facets can be presented to the wheel, and for orbital motion about a vertical axis so that, if necessary, the direction of polishing for a particular facet can be adjusted.
  • the chuck axis is itself adjustable for inclination so that the required angle can be established first for the 16 halves and then for the eight main facets.
  • the machine may have an electric control system including means for automatically lifting the chuck oil? the wheel when the pot or outer ring contacts the wheel and means for indexing the chuck about its axis in 22 /2- degree steps for polishing the 16 halves, and then in 45- degree steps, offset by l1 A1-degrees from the 22 /2-degree steps, for polishing the 8 main facets.
  • an electric control system including means for automatically lifting the chuck oil? the wheel when the pot or outer ring contacts the wheel and means for indexing the chuck about its axis in 22 /2- degree steps for polishing the 16 halves, and then in 45- degree steps, offset by l1 A1-degrees from the 22 /2-degree steps, for polishing the 8 main facets.
  • the chuck axis is set at the angle required for polishing the halves, and the machine is set in operation.
  • the arm lowers onto the rotating wheel surface and commences polishing the first half facet, say 1a.
  • the ring lip 1 comes into contact with the wheel surface.
  • This causes an electric circuit to be completed through the wheel, ring and holder signalling a control to lift the arm off the wheel, index the chuck one 22 /2-degree step about its axis and again lower the arm towards the wheel for polishing the next facet 2a.
  • no electric circuit is established through the wheel and holder when the pot contacts the wheel surface, because the pot is insulated from the holder by sleeve 11.
  • Polishing again commences along line B say to produce main facet 17a. This polishing proceeds until peak A2 formed on the pot during the faceting of the halves contacts the polishing surface. Then an electric circuit is established through the wheel, pot and holder signalling the control system to lift the arm, rotate the chuck through 45 degrees about its axis and again lower the arm so that polishing commences along line C to produce facet 18a. This again proceeds until peak 4a of the pot contacts the wheel when the procedure is repeated. In this manner, the complete ring of main facets is formed.
  • a method of faceting a bruted gem stone held in a pot provided with a surrounding guide ring comprising forming a pair of touching facets common to the stone and pot by polishing on a polishing surface using the ring as a datum to terminate the polishing of each facet when the ring contacts the polishing surfaces in such a manner that the stone touching pot is provided with a sharp upper edge with a projecting peak between the facets, and then forming a further facet on the stone between the original facets by polishing away part of the original facets and using the projecting peak on the pot as a datum for terminating the polishing of said further facet when the peak contacts the polishing surface.
  • a method of faceting a bruted gem stone held in a pot provided with a surrounding guide ring comprising forming a first series of touching facets around the stone and pot by polishing each facet on a polishing surface at the same polishing angle and terminating the polishing of each facet when the ring contacts the polishing surface whereby the pot is provided with a sharp stone touching upper edge with projecting peaks between its facets, then forming a second series of facets around the stone between its original facets removing portions of its original facets by polishing each further facet on a polishing surface at the same polishing angle which is different to the polishing angle for the original series of facets and terminating the polishing of each further facet when one of the pot peaks joining a pair of original facets formed thereon contacts the polishing surface.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Ceramic Engineering (AREA)
  • Inorganic Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
  • Polishing Bodies And Polishing Tools (AREA)
  • Grinding And Polishing Of Tertiary Curved Surfaces And Surfaces With Complex Shapes (AREA)
US690916A 1966-12-20 1967-12-15 Method of faceting gem stones Expired - Lifetime US3534510A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB56979/66A GB1206937A (en) 1966-12-20 1966-12-20 Improvements relating to gem stones

Publications (1)

Publication Number Publication Date
US3534510A true US3534510A (en) 1970-10-20

Family

ID=10478032

Family Applications (1)

Application Number Title Priority Date Filing Date
US690916A Expired - Lifetime US3534510A (en) 1966-12-20 1967-12-15 Method of faceting gem stones

Country Status (8)

Country Link
US (1) US3534510A (ja)
JP (1) JPS5013997B1 (ja)
BE (1) BE708309A (ja)
ES (1) ES349075A1 (ja)
FR (1) FR1548981A (ja)
GB (1) GB1206937A (ja)
IL (1) IL29124A (ja)
NL (1) NL151925B (ja)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5072549A (en) * 1986-09-22 1991-12-17 Harold Johnston Method of cutting gemstones and product
US5462474A (en) * 1994-05-24 1995-10-31 Ronald W. Swager Method of facetting a gem
US6397832B1 (en) * 1998-06-17 2002-06-04 Naotake Shuto Diamond cutting method and new-cut diamond shape
US6604382B2 (en) 2000-11-07 2003-08-12 Naotake Shuto New-cut diamond shape
US20060124119A1 (en) * 2004-07-20 2006-06-15 Naotake Shuto Method for cutting diamond
US20110000259A1 (en) * 2007-12-14 2011-01-06 Strnad Iii Leonard J Gemstone and method for cutting the same
US9226554B2 (en) 2014-05-12 2016-01-05 Yoshihiko Kodama Circular cut diamond

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2088759B (en) * 1980-11-26 1985-03-06 Gersan Ets Gemstone polishing machine
NZ223499A (en) * 1988-02-11 1989-07-27 Keith Snelgrove Shaping vegetables by grinding

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2414598A (en) * 1945-01-01 1947-01-21 Klipper Joseph Method of grinding facets on precious stones
US2449423A (en) * 1943-09-01 1948-09-14 Spira Josef Hillel Bezel dop and grinding device

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2449423A (en) * 1943-09-01 1948-09-14 Spira Josef Hillel Bezel dop and grinding device
US2414598A (en) * 1945-01-01 1947-01-21 Klipper Joseph Method of grinding facets on precious stones

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5072549A (en) * 1986-09-22 1991-12-17 Harold Johnston Method of cutting gemstones and product
US5462474A (en) * 1994-05-24 1995-10-31 Ronald W. Swager Method of facetting a gem
US6397832B1 (en) * 1998-06-17 2002-06-04 Naotake Shuto Diamond cutting method and new-cut diamond shape
US6604382B2 (en) 2000-11-07 2003-08-12 Naotake Shuto New-cut diamond shape
US20060124119A1 (en) * 2004-07-20 2006-06-15 Naotake Shuto Method for cutting diamond
US7192337B2 (en) * 2004-07-20 2007-03-20 Diana Sun Diamond Co., Ltd. Method for cutting diamond
US20110000259A1 (en) * 2007-12-14 2011-01-06 Strnad Iii Leonard J Gemstone and method for cutting the same
US10362843B2 (en) 2007-12-14 2019-07-30 II Leonard J. Strnad Gemstone and method for cutting the same
US9226554B2 (en) 2014-05-12 2016-01-05 Yoshihiko Kodama Circular cut diamond

Also Published As

Publication number Publication date
NL151925B (nl) 1977-01-17
IL29124A (en) 1971-02-25
BE708309A (ja) 1968-05-02
ES349075A1 (es) 1969-04-01
FR1548981A (ja) 1968-12-06
JPS5013997B1 (ja) 1975-05-23
GB1206937A (en) 1970-09-30
NL6717192A (ja) 1968-06-21

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