Disadvantages of Buying a Diamond without the Ideal Proprotions!!

[donny17984]

Hi guys been reserching quiet a lot now and have narrowed my search down and am making a decision in tomorrow.
Question can a Diamond still be great without the Ideal Proportions that Paul Gias Talks about from beyond 4 C's.
I'm going to look at the stones tomorrow both 1.4 and 1.5 carrot G colour SI2 but they don't have the Ideal Proportions.
Table was at 61% 60%. and the others were slightly out. The Jewller has them now and says the are magnificent and sparkle and Fire nicely.

Can this change once I buy them from the shop? What are some of the things I shold focus on whilst viewing the diamonds.
He said the Inclusions are not noticable and only some light feathering.
Just want to make the right decision.

I have 2 more diamonds on hold for 1 day that have perfectly ideal proportions with great hearts and arrows and tripple excellent one is 1.35 carrot vs2 G colour and the other 1.51 carror SI1 I colour. Only proplem is I have not seen in person only online. Any advice would be very greatful.

 

[kenny]

When proportions are poor light leaks out the bottom instead of reflecting back out the top.
The magical light performance only a diamond can deliver is from the cut (proportions) not the color or clarity grades.
Only buy the best cut, even if you have to go down in the other Cs.

If you want a round shape diamond there is a simple 2-step process that ensures ideal cut.
1. HCA https://www.pricescope.com/tools/hca
2. Iealscope, which I'll call IS. https://www.pricescope.com/tools/ideal-scope

Plug 4 numbers from the AGS or GIA grading report into the HCA; it delivers a score.
Reject those scoring over 2.0 and get an IS image on those scoring under 2.0.
Compare the IS images to this chart.
https://ideal-scope.com/reference-chart-ideal-scope-images/




The reason an HCA score is not enough into to make a final buying decision is two of the numbers (the crown and pavilion angles) you plug in are actually each averages of their respective 8 angles around the diamond.
Those could be all the same (a good thing) or all very different (a bad thing) but still AVERAGE out to one good number.
HCA has no way of knowing whether the angles vary, but the IS image will reveal this wonkiness because it is actually a photograph of the diamond taken in a special viewer.

If your vendor can't provide IS find another vendor or buy your own Idealscope here:
https://ideal-scope.com/shop/?product_order=date&product_sort=asc

 

[kenny]

Only consider diamonds graded by GIA or AGS.
Many other labs lie about color and clarity grades.

IOW the same diamond that GIA graded J SI2 if sent to one of those other flakey labs may get grades of F VS1 or even better from these flakey labs.
It is astonishing they get away with this, but they do.
Unless you've learned about this dishonest gem lab grading it SEEMS that you are getting a great price compared to a diamond with the same grades from GIA ... but it's NOT the same thing. It's worse.

You're not saving money buying a diamond graded by a flakey lab.
Actually you are almost certainly paying more than what it would cost with the true (but lower) GIA grades.

 

[oldminer]

On occasion, a diamond with no lab report or a "flaky" lab report is a great deal and can be very attractive. You have to become far more well informed to hope to get such a deal or you need to be a truly diligent shopper. Most folks who buy diamonds without recognized lab documents or without any real documents are seeking unrealistic price compromises and become willing to buy a diamond they like more or less regardless of the quality. All you need to do is "love" or "like" a diamond to buy it. Later on, when you know more about the subject, you may better understand what those compromises were and if they were good things to compromise. Not every deal is what it appears to be, but not every deal is a bad one, either.

Diamonds bought blind, such as many listed only on-line, are far more safely bought when accompanied by a GIA or AGSL report and in the cut range of Very Good to Ideal. There is little doubt to the increased safety and satisfaction for informed consumers when selecting a diamond with accurate grading and Very Good to Ideal cutting.

 

[OoohShiny]

Post the information you have on the stones and the forum can help you.

Who are you buying from? What is the returns policy?

 

[ChristineRose]

If a diamond is slightly shallow, it will face up larger, be bright and white, but have less contrast and scintillation (the changing patterns of light and dark as the diamond moves).

If a diamond is slightly deep, it will be less bright but will have larger and more colorful flashes of light.

In side by side testing, people sometimes prefer the "bad" stones.

Cutters can correct somewhat for these deficiencies by tweaking the minor facets. For example, a stone with a shallow crown can sort of be made into a deeper crown by making the minor facets steeper.

This is impossible to figure out for a online stone, and very difficult in jewelry store lights as well. If you wish to pursue the other stones, insist that you see the diamonds in a variety of lighting, and that you compare the stones to a similar superideal. Do not rely on the jeweler to tell you what is superideal. It's best to use a brand like Hearts on Fire.

 

[Snowdrop13]

I'd take a look on YouTube as a starting point. There are lots of educational videos with stone comparisons. One of the vendors on here, Good Old Gold, does brilliant ones- called Rhino's School of Rock. Spend a few hours looking at them.

 

[WinkHPD]

Hi guys been reserching quiet a lot now and have narrowed my search down and am making a decision in tomorrow.
Question can a Diamond still be great without the Ideal Proportions that Paul Gias Talks about from beyond 4 C's.
I'm going to look at the stones tomorrow both 1.4 and 1.5 carrot G colour SI2 but they don't have the Ideal Proportions.
Table was at 61% 60%. and the others were slightly out. The Jewller has them now and says the are magnificent and sparkle and Fire nicely.

Can this change once I buy them from the shop? What are some of the things I shold focus on whilst viewing the diamonds.
He said the Inclusions are not noticable and only some light feathering.
Just want to make the right decision.

I have 2 more diamonds on hold for 1 day that have perfectly ideal proportions with great hearts and arrows and tripple excellent one is 1.35 carrot vs2 G colour and the other 1.51 carror SI1 I colour. Only proplem is I have not seen in person only online. Any advice would be very greatful.

When you go into a store to look at diamonds, be sure to put your hand above them to block the strong lights in the store. A diamond that is not well cut will show a dramatic loss of sparkle, while a well cut diamond will show a reduction of sparkle, but still have a good appearance.

Personally, I like to have my in-house clients walk to a corner and hunch their shoulders to only allow a small amount of light get to the diamond. An exceptionally well cut diamond will still perform, while a less well cut diamond becomes dull, basically a lifeless lump of crystallized carbon.

Wink

 

[OoohShiny]

When you go into a store to look at diamonds, be sure to put your hand above them to block the strong lights in the store. A diamond that is not well cut will show a dramatic loss of sparkle, while a well cut diamond will show a reduction of sparkle, but still have a good appearance.

Personally, I like to have my in-house clients walk to a corner and hunch their shoulders to only allow a small amount of light get to the diamond. An exceptionally well cut diamond will still perform, while a less well cut diamond becomes dull, basically a lifeless lump of crystallized carbon.

Wink

Is doing that also a good way to check a stone remains white from edge to edge when not being directly hit by light rays? (i.e. a good test of performance in diffuse lighting?)

 

[WinkHPD]

Yes. It is surprising how good some stones can look with even minimal light striking them.

Wink