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Left Tear Drop has better polish

3 (27.3%)

Right Kite has better polish

5 (45.5%)

Same - Polish is equal on both gems

3 (27.3%)

Total Members Voted: 11

Voting closed: January 09, 2018, 11:57:34 AM

[finegemdesigns]

I have included an image of both stones but a a second look is in the video to see reflections.
The material is lavender jadeite from Guatemala.



https://www.youtube.com/watch?v=OD6U9rwn_wo

I used 2 common finishing techniques to polish these stones.
The 2 techniques applied will be revealed at the end of the poll.

Please also cast your vote and opinions in the comments section here and at youtube.

 

[bobby1]

Teardrop on left is better. The surface is less pitted and grainy
Bob

[hummingbirdstones]

They look the same to me.   

On the video the right kite looks more shiny, but I think it's from the shape and the way the light is hitting it.  (My eyesight sucks!)

[vitzitziltecpatl]

Teardrop surface is smoother - but that could be difference in rough.

Light reflection is sharper in kite shape. Edge of light is more defined. If dome profile is same on both I vote for the kite.

[Redrummd]

The one on the left is better. Send me the kite and I will try "scuff" polishing on it and then you can compare that to what you did.....

[finegemdesigns]

I'm going to give a few more pieces of information.

One of these cabs was polished with all diamond to 1200 then Poly-Al-F (Aluminum Oxide) polish on leather.

The other was polished with all diamond to 1200 then 14,000-50,000-100,000.

Shaping and rough grind was the same on both with coarser grit diamond.

The back flat surfaces were used since they work better for reflections. But as we all know curved surfaces are easier to polish and gain a more reflective surface. But curved doesn't work as well in a test like this.

Both cabochons were cut from the same piece of rough jadeite.

Note to bobby1: There is no pitting on either of these cabochons lol.

[vitzitziltecpatl]

Hmmm. I thought this poll would generate more comments than it has. Over eighty views, but only nine votes. A bit of a surprise to me. Seemed like an interesting bit of fun.

Now - being from the "immediate gratification" generation - I just want to know the bloody answer... .

Finegemdesigns - that last bit was said in jest. Well, mostly, anyway. My Zen must be broken.

[finegemdesigns]

4 more days. Want to get as many votes as possible.

 

[Windenzee]

If the 2 shapes were the same, then this world be a more equal judgement. The type of shape can give a different visual effect.
Karen

[vitzitziltecpatl]

The shape comment is good. Finegemdesigns' statement that the flat backs are shown helped me a little.

When first viewing it I had assumed we were seeing the face sides with some degree of low dome.

[ileney]

The kite is closer so the flash shows more, but I'm not sure it is really better, or if my eyes are deceiving me. I think this is the kind of test that is easily resolved in person, but much harder to tell via video or picture. Perhaps if both were the same shape and the camera were focused between them so that the light source was equally distributed, I would know if the kite is actually better or not.

[vitzitziltecpatl]

The video does show the light (it's a fixed lamp) reflection moving across both of them. I still didn't pick up that we were seeing the flat backs even in the video.

[finegemdesigns]

The kite is closer so the flash shows more, but I'm not sure it is really better, or if my eyes are deceiving me. I think this is the kind of test that is easily resolved in person, but much harder to tell via video or picture. Perhaps if both were the same shape and the camera were focused between them so that the light source was equally distributed, I would know if the kite is actually better or not.

Just a note: Both cabochons are the same distance from the camera. Also the light that is reflecting is to the LEFT so technically speaking the tear drop is closer to the light. Not much but it is.

I'm thinking I might do another test after this with something more uniform like clear quartz. This would allow viewers to see the shape of the light better to see which edges are sharper in the reflections. The internal chatoyance of the jadeite seems to create some slight blurriness in the reflections.

[Phishisgroovin]

i watched the video a couple times staring at the shine. they both look fairly even to me.

[ileney]

The idea of using clear quartz wouldn’t completely resolve the question in my opinion, because some techniques work better for one material and other techniques work better for another. However, using as close as possible to identical pieces of the same material would resolve which technique to use for that particular material.