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8/20/08 10:40 PM
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Precision Gem Blog

Umba Sapphire and Morogoro Spinel

12/08/08 18:35
Two new stones today. The first is a Sapphire from Umba Tanzania. This one I cut in a emerald type shape, but not a traditional emerald cut. What's nice about these Umba sapphires is that they are all natural, no heat or other treatments. They also show a color shift depending on the lighting. This one goes from a violet to purple depending on the light.

768

The next stone is a Spinel from Morogoro area in Tanzania. This one has a real nice color and a nice size. It's 3.32 cts. and measures 8.5 mm.
767

Tags: Sapphire

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Blue Sapphire and White Topaz

23/07/08 21:41
Two new stones this week. The first is a blue Sapphire from Madagascar.
761

This second stone is a white topaz from Nigeria cut in a snowflake design with frosted facets. The frosting shows up better in person, especially with a darker background. Makes for a fun interesting stone.

762

Tags: Sapphire

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Two new garnets

13/07/08 22:02
I finished up two new garnets this weekend. Both are at the top of their class for color, and both are from Tanzania.
The first is an Umbalite, followed by a very nice yellow Grossularite. These are the same type of garnet as mint and tsavorite, but yellow.

760759

Tags: Umbalite & Yellow Grossularite Garnets

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Yellow Zircon

10/07/08 22:00
Here's one I missed photographing the other night. It's a Zircon from Tanzania. These stones are kind of a root-beer brown color, but with just some gentile heating over the flame from an alcohol lamp they turn yellow. The more you heat them, the lighter the get. This one I just heated a bit. If you heat them too long, the will go colorless.
754

Tags: Zircon

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Pink Spinel from Tajikistan

08/07/08 20:21
Just finished up a new spinel. This is another stone from Tajikistan that is 5.07 cts. Rather large for these spinels. Here's an article by Richard Hughes and Vincent Pardieu dealing with ruby and these spinels from Tajikistan.

757


I haven't been slacking the past week, I was actually working on some stones for one of them members of the GemBusters forum. Here they are..
Try to guess what they are!

756755750749

Tags: Spinel

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Color Change Purple Sapphire

26/06/08 21:57
The newest stone is this 1.68 ct. Color Change Purple Sapphire. A very special stone. First this is an all natural stone with no treatments, not even heat. This alone is very rare in a sapphire as about 95% of all sapphires have been heat treated. The stone also possesses a color change. It's hard to photograph the color change with my lighting set up, but the images below from Gem-e-Wizzard show the color of the stone in various lighting. This one would make a very interesting and unique engagement ring stone.

752

The stone measures 7.5 x 5.6 mm, has excellent saturation and crystal. The origin on this gem is the Umba region of Tanzania Africa. This area is known for an abundance of fine gems including Sapphires, Garnets and Spinels.

This first image is the color of the stone in daylight and florescent lighting
Dayllight
This image is the color change with incandescent lighting.
Incandescent
The actual photo of the stone is shot with a mix of both lights with the majority of the lighting incandescent.

Tags: Sapphire

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Pink Tourmaline and some commissioned work

09/06/08 23:32
Just one new stone to add to the site this week, but I have been busy doing some commissioned work. It may seem like there are not many new stones being cut, but lately a lot of the cutting has bee per special request. If you don't see what you are looking for, give me a call or email, as there is a good chance I will have a piece of rough and could cut you a gemstone in the design and shape you are looking for.

The new stone on the site is this Pink Tourmaline. A beautiful 4.18 ct stone.
746
The other gems I finished up this week were this 3 stone set cut from Tanzanian Spessartite garnet. This is from the new find this year. The color on these is great. My main dealer in Kenya is telling me that this find is about dried up. This is pretty typical in the colored stone mining, they find a small pocket, and with in months it's worked out. These 3 stones total a bit over 4.25 cts.

747

Tags: Tourmaline

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New Sapphire and Tourmaline

01/06/08 13:41
Two new stones for today, the first is a sapphire from Madagascar that is all natural with no heat or other treatments. The next stone is a light green tourmaline from Mozambique Africa cut with a checker crown cushion shape.

742743

Tags: Sapphire

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Peridot from Pakistan

27/05/08 21:43
Here's a new Peridot from Pakistan. Really nice color on this stone, and one of my favorite cuts.
734
These stones from Pakistan are a bit hard to come by lately, especially in this nice color.

Tags: Peridot

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Latest Cut Gems

26/05/08 18:50
Three new stones this week: A blue sapphire from Songea Tanzania with NO HEAT or other treatements, a Rubellite Tourmaline from Nigeria, and a Chrome Pyrope garnet from Tanzania.
739
Songea Sapphire
740
Rubellite Tourmaline
741
Chrome Pyrope Garnet

I'm thinking about cutting something green next... maybe a tsavorite or a chrome green tourmaline. Enough red stones for awhile.

Tags: Sapphire

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Sapphire Recut

19/05/08 20:02
This is a picture of a recut sapphire. I didn't get around to taking a before picture, but it was the typical native step cut. Lopsided, poor meets and a deep belly along with a window.
For the recut I did a concave cut to bring out some more color from a light stone.

SapphireRecut

The finished stone is 3.12 ct.

Tags: Sapphire

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Spessartite Garnet - NEW Find in Tanzania

19/05/08 19:58
Here are two new stones that are from the new find of Spessartite in Tanzania. The color on these stones is a fantastic fanta orange. All the stones from this find will have small bubbles, the camera really picks them up. In person they are not as noticable.

738 1.95 ct
721 1.57 ct.

See the orange garnet page for more details.

Tags: Spessartite

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Latest cut stone - May 11th

11/05/08 14:05
Here's the latest cut stone. This one is a yellow tourmaline from Mozambique. I just finished the design this week, and the shape of the rough fit well with the design.
736
For more details on this gemstone see the Fancy Tourmaline page.

Tags: Tourmaline

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Oregon Sunstone

04/05/08 18:00
Here's a new Oregon Sunston. This one is cut in a bar crown round. This one has excellent crystal with no schiller. The color pocket doesn't extend through out the entire crown, so if you tilt it far, you will see the lighter area's in the crown. Face up the color fills the entire stone. Measures 8.63 mm.
733
See the Other Gems link for detail of this stone and to purchase it.

Tags: Oregon Sunstone

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Peridot

25/04/08 18:31
Just finished up this Peridot from Pakistan. I picked up this piece of rough at the Tucson gem show this year. The color was just fantastic. I do have a few more pieces and will be cutting at least one or two before August.

Tags: Peridot

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