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Mouse's House Antiques

Amazing 2.5 Carat Old Mine Cut DIAMOND French Antique PLATINUM Rose Cut Architectural Ring Art Deco

Amazing 2.5 Carat Old Mine Cut DIAMOND French Antique PLATINUM Rose Cut Architectural Ring Art Deco

Regular price $4,500.00 USD
Regular price Sale price $4,500.00 USD
Sale Sold out
Shipping calculated at checkout.
Type: Ring
Materials: Diamond, Platinum
Size: 7, 2.5 Carat Tdw
Era: Edwardian to Art Deco, Early 1900s


Eee! I love this one. Something about its design makes me think of Great Gatsby, with some amazing antique diamonds and a great architectural quality. Almost like you'd see in a period movie about the Art Deco period. The 1 carat center old mine cut, stepped sides and 2.5 carats total weight in diamonds crafted in platinum are show stopping enough, but These Diamonds!!.....

To be honest, I love antique diamonds, even those with inclusions or hues typical for the time, because some of those were still among the best available in the market during that period, and were expertly cut by hand to enhance their best characteristics. So I don’t often prefer to compare antique stones against modern grading standards which were created much later for machine cut diamonds - BUT These Diamonds for old stones have a particularly lovely fire reflecting a noteworthy flash with the colors of the rainbow. It was actually quite noticeable, especially while trying to photograph the ring. The three, nice sized old mine cuts have a bright color and wonderful rainbow sparkle so even though the stones were made long before the 4 C's existed, this one really shines. I'm amazed by it now as I wear it in low, ambient light how glittery and bright it still is.

These old mine cuts are scarce and sought after for a few reasons - the first is that all antique hand cut antique diamonds of course have a more limited supply since they are no longer made in this way. There are only so many in existence compared to the millions of carats of modern machine cut diamonds made every year. These have withstood the test of time. But adding to that the particularly nice clarity and fire to the diamonds makes this piece even more exceptional.

Setting the three wonderful, and nice sized center stones in a line at center in their square settings creates a striking geometric footprint on its own, but then we add in the 16 additional rose cuts for an additional, slightly different, untamed sparkle in linear settings at each shoulder.

What a gem - literally!

French hallmarks for platinum.
Antique box is not included. Please note the measurements as I have small fingers and it can be difficult to determine scale from photos.


Size 7, slightly over. The ring face is 20x15mm. It weighs a sturdy 5.3 grams. The center diamond is about 6.2x6mm with a nice crown measuring around 1 carat, the two flanking around 5.2x5mm measuring around half a carat each. At the shoulders are the 16 additional rose cuts measuring 1.5 to 2mm each. Just using online calculators and estimations by millimeter, I am calculating around 2.5 carats total weight in diamonds - Note exact depths in the setting are unknown as I would never remove them so this is an estimation.


All my pieces are pre-owned and in estate condition. As mentioned previously these old mine cuts have an amazing fire. The center diamond has just one icy flake inclusion seen only under magnification. One of the flanking diamonds has really nothing detectable at all even under magnification and the other flanking diamond has a brownish silk inclusion, almost needle like which is slightly eye visible if you have good eyes and are really looking for it (my eyes are in their 40s and can't quite find it: ). They have a slight warmth under magnification but they face up bright and shoot rainbows of sparkle from each of them. They are particularly fine antique diamonds, imho. The rose cuts on the outsides are typical for the period with some rough or frosty edges with a bit of loss, some nicks, and natural inclusions. This is what we often see on rose cuts with age because they were rough cut by hand and being cut thinner by nature, become more prone to wear. But some of the aforementioned may have always been this way since they were rough cut, this is quite often how they seem to look time and again. They definitely have more wear, with an untamed frosty appearance. These aforementioned notes to the rose cuts are eye visible but less so because they are smaller stones and just meant to add another layer of sparkle to the architectural face. It's a wonderful piece. But Due to age - please note this is not a mint condition item.

Thanks so much for looking at my items! I'd be delighted if you'd follow me in my shop!

Please feel free watch @mouseshouseantiques on Instagram for inventory drops, sneak peaks and previews! And check out my website

A note about antique diamonds:
The whole "4 C's" of cut, color, clarity, carat didn't come about until the 1940s so prior to that and especially on antique pieces, there was not as much emphasis placed on those things. (Sure people probably appreciated a certain look of a certain diamond as it appeared to the eye but it was not a graded scale like we have today.) So it is difficult to judge antique stones against modern day diamonds and their grading system. No two old cuts are the same as they were crafted in times lacking any modern standards. The diamond cutters of the time were experts at hand cutting each stone to enhance it which means that even lower color grades can be cut to appear whiter. (Although it is also worth noting that many antique collectors prefer and seek out antique diamonds with warmer hues.)

It is also interesting that "lower graded" diamonds in today's scale system, were some of the best on the market during this period! So it is less about their grades and more about the unique play of light and color that each one can offer. I read one article that described it: “When searching for the perfect old cut diamond (for you), you need to view them through different eyes as you would for a modern diamond, Laboratory grading reports don’t offer too much information in regards to their individual beauty or sparkle which are based more on their individual character and uniqueness that each one potentially offers.”


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