Visual Difference between a 1.5 and 1.8 stone?

I would like to know also

I have no pics comparing the two, but yes IMO it's definitely noticeable. In my experience I see a memorable difference in size as long as there's at least a 0.3mm increase in diameter for stones up to 2ct.

Here's a video from GOG comparing 1.50ct vs 1.70ct vs 2.00ct: http://vimeo.com/26931860

The size difference between 1.5ct and 1.8ct is more like the size difference between the 1.70ct and 2.00ct in the video.

Thanks,......based on the video - there doesnt seem to be much of a difference between 1.5 and 1.7?

or is it just my eyes??

Written by nelly81 » February 28th, 2012, 3:47 am:Thanks,......based on the video - there doesnt seem to be much of a difference between 1.5 and 1.7?

or is it just my eyes??

I saw a difference. And you would be going up to a 1.80 not a 1.70 right? So there would definitely be a difference.

I agree. If the two stones you are considering are cut similarly, then you should be able to see the size difference. I have seen a well cut 1ct beside a not well cut 1.5 and couldn't see a huge difference because of the poor cut quality. So, if all things are equal you should be able to clearly see a size difference.

EDIT: Although you should be able to see the difference in size, it still may not be enough for you justify spending the additional $. I found that a 1.5 gives ME enough finger coverage, and that the cost of getting into a 1.75 vs the minimal size differance wouldn't be enough for ME to make the additional investment.

Thanks everyone!!

Depending the price difference vs the visual difference, I was comparing a 1.5 v a 1.7 AND a 1.5 v 1.8.

I know the minimum spread (or face up appearance) of a 1.5 stone should be 7.4mm.

What the minimum measurements for a 1.7 and a 1.8 stone?

Christina - your cut comments are so interesting! I had never thought of that. Yes - I would be comparing stones of equal cuts - AGS000 or GIA triple ex!

Thanks!

I think you have I way out the cost difference. That would be my deciding factor

For AGS 0/GIA Ex, if you look through PS search, 1.7ct is generally around 7.7mm and 1.8ct is typically around 7.8mm.

I read somewhere that .1 mm is the smallest distance that the human eye can readily distinguish, assuming normal vision and viewing.

But since you probably aren't wearing two similar stones of such size right next to each other, I wouldn't worry about a difference as small as .1.

But you're talking about .4 to .5, which is definitely noticeable.

I have had a 7.6mm and a 7.45mm diamond and I could absolutely see the difference. No question that a 1.8 would be noticeably larger than a 1.5. A 1.8 is a good range for someone who really wants 2 cts but whose budget needs to say under 2 cts for the specs they want.