GemWorld provides...


You can cut and polish your own spheres
with these machines

Two-cup machines will produce excellent spheres
and are generally the most used version.
A three-cup machine is sometimes preferred
for faster preliminary grinding,while the two-cup
produces a more perfectly round sphere.

"Cutter Cups"
for Sphere Machines that utilize
3/4" National Pipe Thread

by Covington
The 4" Diamond Cutter Cups grind faster than conventional silicon carbide cutter cups. The Sintered Diamond Cutter Cups are aggressive without being harsh and accommodate spheres from 3-3/4" to 6-1/2". The Resin Bonded Diamond Cutter Cups provide better control and grind quickly. These are designed for finishing spheres. All cutter cups come with 3/4" National Pipe Thread.

Sintered Diamond Color Weight Price
Coarse 40/50 grit Red 3 lbs, $125
Medium 100/120 grit Green 3 lbs. $125
Fine 180/200 grit Yellow 3 lbs. $125
Resin Bonded Color Weight Price
Coarse 100 grit Black 2 lbs. $60
Medium 220 grit Purple 2 lbs. $60
Medium/Fine 320 grit Brown 2 lbs. $60
Fine 600 grit Red 2 lbs. $60
Extra Fine 1200 grit Blue 2 lbs. $60

Made in usA

"Little Sphere Maker"

by Covington

Make beautiful gemstone spheres 1/4" to 1" in size, automatically.   Has a dual 1/18 hp, 110 volt motor, with an automatic grit application, spring loaded cutting angle adjustment.  The downward slanted cutter cups and shafts run the sphere in a bath of grit.  This eliminated the need to constantly dab grit on with a brush.  It also causes the grit slurry to run away from the bearings.  The angle of the cutting cups can be increased as the rough corners of the sphere grind off.  Both heads are spring loaded so continuous adjustment in unnecessary.  Unit comes complete with 1 grind pan, instructions, guarantee, and one pair of 1/4", 3/8", 5/8", and 7/8" cups.  Machine size 23" long x 14" wide x 10" high.

List Price for 110v 60Hz is $549.95.
Our everyday low price is $529.95.

List Price for 220v 50Hz is $599.95.
Our everyday low price is $579.95.

Little Sphere Maker Extra cups (ship wt. 1 lb each)
1/4in. $18.50
3/8in. $22.75
5/8in. $29.00
7/8in. $34.25

Shipping weight is 28 pounds.

Or, you can purchase polished Spheres from us.

Large Sphere Maker
"Two Head"

by Covington

Dimensions are 43" x 19" x 43" and it has the following features:
  • Dual 1/3 hp. 110v motors.
  • Automatic Grit application with slurry bowl.
  • Spring loaded cutting heads.
  • Cutting angle adjustment.
  • Shielded arbor shafts and bearings.
  • Large metal cabinet with shelf.
  • Makes beautiful spheres from 1 1/4" to 9" in size.
The downward slanted cutter cups and shafts run the sphere in a bath of grit. This eliminates the need to constantly dab grit on with a brush. It also causes the grit slurry to run away from the bearing. The angle of the cutting cups can be increased as the rough corners of the sphere grind off. Both heads are spring loaded, so continuous adjustment is unnecessary. Unit comes complete with the above features, 2 polishing buffs, 2 grit pans, instructions, guarantee, and choice of one pair of cutter cups. Please state cup size when ordering.

List Price for 110v 60Hz is $1,650.00.
Our everyday low price is

Shipping weight is 260 pounds.

List Price for 220v 50Hz is $1,700.00.
Our everyday low price is

Shipping weight is 280 pounds.
Please email to receive freight quote.

Or, you can purchase polished Spheres from us.

"Three Head"

by Covington

Now you can make spheres from 2-1/2" to 10" in size. The motors are 1/6 hp, 60 hz, 110 volt, 156 RPM, and 60 in. lb. torque. The available 220v 50 Hz runs at 130 RPM. All independent floating heads for greater control, mounted on swivel base, spring loaded and fully adjustable. Mounted on a lami-cushion base, spin handles for each head for quick adjustments and cutting ability. The unit stands 36" high with water and grit feed stand. Without it the unit stands 18" high. Heavy steel frames and guides. Complete with water supply, grit dispenser, instructions, and guarantee. choice of one size of cups - please specify. Comes fully assembled. Dimensions are 43" x 39" x 21"

List Price for 110v 60Hz is $2,750.00.
Our everyday low price is $2,625.00.

Shipping weight is 255 pounds.

List Price for 220v 50Hz is $2,775.75.
Our everyday low price is $2,650.00.

Shipping weight is 305 pounds.
Please email to receive freight quote.

Or, you can purchase polished from us.

"Three Head"

Manufactured by Jayhawk

This machine is designed for re-finishing bowling balls but can be modified to be used on rock type materials. You can add more resistance between the motors and the sphere by adding a heavy duty type of a spring to apply more pressure against the sphere.

You may also have to switch from using the pads that come with the machine to using cups made from PVC pipe or metal pipe modified to be placed on the shaft of the motors.

Also, may need to switch from using the pads to using powdered abrasives with a water drip system instead of the water recycling system that comes with the machine.

If you do use the recycling system that comes with the machine, you may have to install a filtering system.

    If used as is for bowling balls:
  • Finishes ball to uniform roundness every time!!
    (including balls with new or old plugs)
  • Solid stainless steel construction prevents rust and corrosion
  • Single set adjustment for hands-free operation
  • Slurry recirculation prevents build-up
  • Enclosed design eliminates splash over
  • Helps to remove lane oil from ball
  • Choose from 2 models:

  • #15-3910 - 10" Cabinet
    #15-3920 - 32" Cabinet
  • Full one year warranty
List Price is $3,995.00.
Our introductory price is $3,850.00.

Shipping weight is 240 pounds.
Please email to receive freight quote.

Comes fully assembled, adjusted and tested by professionals.
Included with your Cook Sphere Machine are the following items.
  • 6 - Contour Abrasion Blocks
  • 2 - 5" 320 grit packages of sandpaper (packages of 9)
  • 2 - 5" 400 grit packages of sandpaper (packages of 9)
  • 2 - 600 grit packages of sandpaper (packages of 9)
  • 3 - 5" Lambswool polishing pads
  • 1 - slurry recirculation pump
  • 1 - 5 gallon bucket
Adjustments " If there is unequal pressure on the motors the desired rotation will not be realized. To correct the pressure difference adjust the stainless steel carriage bolts found at the base of each motor mount. Be sure the lock nut is secure after making adjustments. A 9/16" wrench is required. " It is sometimes most effective to reverse the direction of rotation of one motor in order to achieve the random motion that does the best job. Warning: Be sure the machine is turned off before changing the reversing switch position!!

Or, you can purchase polished Spheres from us.

All items are subject to availability.
Prices may change at any time.

To Order

Minimum Order is $50
Orders Less than $50 will be charged an additional $8.50

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$9.50 minimum
Add 75 cents per 5 pounds of weight for handling.

$2.00 minimum.
(UPS cannot ship to P.O. Boxes.)

Apply the following rates

for shipping and handling costs
anywhere in USA by carrier and service of our choice:

under 3 pounds,
under 3 pounds, add $13.50,
3 pounds to 4.9 pounds, add $16.50,
5 pounds to 9.9 pounds, add $19.50,
10 pounds to 14.9 pounds, add $27.50,
15 pounds to 24.9 pounds, add $39.50,
25 pounds to 49.9 pounds, add $49.50,
50 pounds to 69.9 pounds, add $63.50,
70 pounds to 99.9 pounds, add $83.50,
100 pounds to 149.9 pounds, add $139.50,
over 150 pounds, FOB plus $15.00 for handling.

Ask for costs for shipping outside of USA.

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but allow 15 working days to clear bank processing.

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Info on California Sales Tax

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If you want insurance, add these charges to your order.

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Jack Slevkoff's Prized Possessions Division
c/o 4460 West Shaw Avenue, Suite 140
Fresno [Non-Domestic]
California [Zip Exempt]

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