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Is 1.8 mm too thin for a 2.5 carat diamond?

Klaus

Rough_Rock
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Mar 10, 2018
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Hi all. So my partner and I have procured a beautiful center stone which we saw today in person at our jeweler’s showroom. Partner selected a setting while I browsed bands, and he let me know afterwards that he requested it be 1.8 mm. I had told him general parameters for the setting but he wanted to make the final choice and surprise me, and one of the parameters I gave him was I liked bands between 1.8 and 2.3 width. However, now I’m a bit concerned that 1.8 will be dangerously thin. I love my stone so much, never plan to upgrade it, and would be devastated to lose it.
After some research online, including this board, it appears to me that the general wisdom is that this is not a binary issue, as in, a certain width is not safe or unsafe just by virtue of millimeters, but rather it’s contextual to the specific setting and treatment. I’m curious how risky you all would find a 1.8 mm in my case, so here is some relevant context:
- As mentioned, the stone is 2.5 carats.
- The ring will not have pave on the band.
- I plan to wear the ring very often, only remove for showers, working out, and sleeping.
- I don’t really work with my hands (unless you count typing up endless emails!)
- The jeweler is very legit and universally well-regarded, so I assume that he is taking structural integrity into account, though obviously two good people can have differing opinions on structural integrity.
- I do not want to feel stress and pressure to baby my ring, but I don’t think I’m particularly hard on my jewelry.
- Once I’m married I plan to only wear this ring next to a 2-3mm band.
- Setting is platinum.

I’m contemplating asking partner to either ask for 2mm, or at least confirm with the jeweler that 2mm would not be game-changing-ly stronger than 1.8mm… I would not want to go over 2.2 max, and would prefer 2.0 or less, visually.
Penny for your thoughts?
And as a reward for making it through my novela, here is a pic of my gorgeous 2.5, VS1, E beauty (please don’t judge my weird nail polish, I was going for something that didn’t quite work out, haha):

FC329229-5610-473D-A3C5-0D052E8867E5.jpegFC329229-5610-473D-A3C5-0D052E8867E5.jpeg
 
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Also the band is a wedding band to see how it went with the diamond, I believe it was 2-2.5 width, just FYI.
 
Your diamond is beautiful! I have a thinner setting in 18k white gold. I purchased it from Whiteflash as a temporary setting but have grown to love it.. It’s 1.9 width and 1.7 thickness. My diamond is 3.01 carats. It’s perfectly fine. It feels very sturdy even though it’s the lightest and thinnest setting I ever had. The diamond feels very secure. I like to wear it with various width bands...
841905ED-7D3C-44BB-BDF5-3D2EE25F231D.jpeg80753966-480A-42E5-917B-11CB8657233A.jpeg
 
Thank you MamaBee! Love your diamond and your stack, gorgeous. I love the proportion of a thinner engagement ring band with a thicker wedding ring - partly because I want the wedding ring to be substantial enough to look good alone, while the engagement ring I'll always be wearing with the wedding ring, after the wedding...
 
Thank you MamaBee! Love your diamond and your stack, gorgeous. I love the proportion of a thinner engagement ring band with a thicker wedding ring - partly because I want the wedding ring to be substantial enough to look good alone, while the engagement ring I'll always be wearing with the wedding ring, after the wedding...

Thank you @Klaus Please post your photos when they’re done. We LOVE seeing them..
 
Will do! I've drooled over so many amazing diamonds on this forum, time I paid it forward. :)
 
Its a beautuful combo and it looks lovelly on your hand

but i prefer the look and substance of wider bands

They will cone back into fashion
 
Its a beautuful combo and it looks lovelly on your hand

but i prefer the look and substance of wider bands

They will cone back into fashion

Thank you! I’m so thrilled with this diamond! And I think upon reflection I would indeed feel more comfortable at 2mm. It seems that is still plenty dainty, and would be a good fit to this stone.
And yes I promise to come post the finished ring. I honestly owe all my diamond knowledge to this sight. It’s insane and sad how shady buying a diamond can be.
 
You should check out my recent thread. I have a 2.738 carat 9.11 mm in diameter. I had my diamond reset into a new setting with the thicker band and I am MUCH happier. I find it way more comfortable, spins less, and looks more balanced with my 3mm eternity band. My previous ring was very top heavy and the diamond never stayed upright.


Based on the measurements it sounds thick but since it’s a knife edge it looks really slim.
 
Depth is key here. This is a great example from a recent thread:


You can see how thin it looks from the top, but the side view shows the depth. That ring is plenty sturdy! This is a good way to get a visually thin ring that is robust.

I have a 2mm width wedding ring that is close to 2mm depth - pretty sure I could drive a truck over it and it would be fine (I'm not going to try, don't worry). I have another ring that is 2mm width and 1mm depth that is much more flimsy.

I would stick with 2mm minimum for a ring you intend to wear daily for many years - but also make sure you go for good depth.
 
You should check out my recent thread. I have a 2.738 carat 9.11 mm in diameter. I had my diamond reset into a new setting with the thicker band and I am MUCH happier. I find it way more comfortable, spins less, and looks more balanced with my 3mm eternity band. My previous ring was very top heavy and the diamond never stayed upright.


Based on the measurements it sounds thick but since it’s a knife edge it looks really slim.

Your ring is so beautiful, such a classic setting! The eternity band I like is also 3mm. How thick is your engagement ring band now?
 
Depth is key here. This is a great example from a recent thread:


You can see how thin it looks from the top, but the side view shows the depth. That ring is plenty sturdy! This is a good way to get a visually thin ring that is robust.

I have a 2mm width wedding ring that is close to 2mm depth - pretty sure I could drive a truck over it and it would be fine (I'm not going to try, don't worry). I have another ring that is 2mm width and 1mm depth that is much more flimsy.

I would stick with 2mm minimum for a ring you intend to wear daily for many years - but also make sure you go for good depth.

Good point on the thickness. And what a beautiful, dainty-looking band! That makes me feel confident that a 2mm will still give me the look I'm going for.
 
Okey dokey, he's spoken with the jeweler and the band thickness will now be 2mm. Thanks everyone for the invaluable input! Pricescope to the rescue, as usual. :razz:
 
You should check out my recent thread. I have a 2.738 carat 9.11 mm in diameter. I had my diamond reset into a new setting with the thicker band and I am MUCH happier. I find it way more comfortable, spins less, and looks more balanced with my 3mm eternity band. My previous ring was very top heavy and the diamond never stayed upright.


Based on the measurements it sounds thick but since it’s a knife edge it looks really slim.

It is 3mm on the top and tapers to 2.6 at the bottom.

EAB151ED-419A-4B7D-876C-9F47ADCC562B.jpeg

Even though 3mm sounds thick, I feel like it looks really slim because of the tall knife edge.
 
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Wow yeah it does not look 3mm, @mtran89. Knife edges are so pretty, plus the height adds more structural integrity. Unfortunately the ones I've tried on were not comfortable to me - maybe I have sensitive fingers, haha.
 
Your diamond is beautiful! I have a thinner setting in 18k white gold. I purchased it from Whiteflash as a temporary setting but have grown to love it.. It’s 1.9 width and 1.7 thickness. My diamond is 3.01 carats. It’s perfectly fine. It feels very sturdy even though it’s the lightest and thinnest setting I ever had. The diamond feels very secure. I like to wear it with various width bands...
841905ED-7D3C-44BB-BDF5-3D2EE25F231D.jpeg80753966-480A-42E5-917B-11CB8657233A.jpeg

Mamabee! LOVE your all baguette band. Fabulous!
 
OP has already decided but for future readers I agree that a thicker band is more comfortable. For 8-9mm a band that is 3mm on the bottom and tapers at the top would feel sturdy but look elegant. Opinions vary though!
 
None of these really do the ring justice, I’m still learning to take diamond pics, but here she is! 2.5 carat, E color, VS1, and I’m engaged to marry the live of my life!
 
It looks absolutely gorgeous! The setting is just perfect for the diamond. Great choice.
 
1.8 is on the lower edge of "best". Safer is 2mm+ in terms on longevity. However, width is not the entire story. While few jewelry retailers really control the metallurgy involved in their settings, the hardness and flexibility of the metals mixed together is a definite factor with long term strength. Another highly important variable is the much more obvious thickness of the shank from your finger to the outside of the shank. If you have a 2mm shank that is shallow, it will be weaker than a 1.8mm shank that has sufficient depth. It is the width and depth which combine to create the strength, not simply the width of a shank. Think about it. A 3mm shank which is nearly as thin as a ribbon will easily bend or tear. A 2mm shank with more proper depth will be far stronger in preventing bending or tearing.

For the most part, losses occur when a prong setting which is attached at a single point on the ring shank shears off. That design is inherently weaker than a setting with multiple soldered or cast points of contact to the shank. Lower settings are less likely to bend or tear off. Tall settings allow more leverage to be applied and the result can be more frequent losses.

When people want a ring to keep for a lifetime, they should pick a solid design that is a bit on the heavy side. It will thin a little over time, but it won't break or bend. It costs more for more metal. Thin rings may initially look a bit more elegant while heavier rings just last and last. A middle of the road compromise may work best for combining beauty and design together. Loving the ring is not a problem, but if it falls apart or creates maintenance issues because it is overly delicate, you will not stay in love with it as long a time as you had planned.
 
It is pure perfection, the band width is just right. Looks amazing on your hand! Congrats and enjoy your new ring and this happy time in your life!
 
Thank you all! Very happy times. Now to plan a wedding!
 
A couple more. Yaaayy!
 
Oh and for the record he went with 2mm, and chose this very delicate basket head with eight total prongs and four tiny diamonds on each side… it’s classic but unique at the same time, with hidden detail that is meaningful to us (the eight tiny diamonds). Not for everyone but truly perfect for me, my style, and our relationship. I would never have chosen 8 prongs but really love the look and uniqueness of it, and also that the diamond is more protected.798435E9-4C6A-4E2A-B403-5E22326AB690.jpeg65D45AC0-3FE2-44EC-B77F-CCE7EE777456.jpeg,
 
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Beautiful!!!! Can you please share your ring size? Apologies if you already have and I just missed it :)

Oh and for the record he went with 2mm, and chose this very delicate basket head with eight total prongs and four tiny diamonds on each side… it’s classic but unique at the same time, with hidden detail that is meaningful to us (the eight tiny diamonds). Not for everyone but truly perfect for me, my style, and our relationship. I would never have chosen 8 prongs but really love the look and uniqueness of it, and also that the diamond is more protected.798435E9-4C6A-4E2A-B403-5E22326AB690.jpeg65D45AC0-3FE2-44EC-B77F-CCE7EE777456.jpeg,
 
Beautiful! I love the 8 prongs and 8 tiny diamonds.
 
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