Friday, July 15, 2011

A Story of Diamonds: Cuts through the Ages - Old Mine Cut

The next metamorphosis in diamond cutting proved even more brilliant than the last. By tripling the number of facets, diamond cutters released more brilliance and fire from the depths of their diamonds than ever before. It also preserved a good deal of the weight of the original crystal.



The girdle profile still mimics the squared shape of the crystals these were fashioned from. You can see, also, the form of the single-cut before it was embellished with extra facets. In the diagram below, I have colored the new facets pink.



The proportions are different, but this cut possesses all of the facets of the modern round brilliant as shown in this diagram:



The Old Mine cut is deep with a small table and often squarish in shape. The depth allows light to leak out of the gem, so they are less bright than modern stones. The facet arrangement and small table, however, encourages a good deal of dispersion which is the breaking up of light into spectral colors. You might call this fire.

A couple more things worth noting about antique diamonds: because these were fashioned from well formed octahedrons, the clarity is often quite good. The Old Mine is also the precursor to modern cushion cuts.



For your Drooling Pleasure

SJA does not endorse the Three Graces website in any way, they just happen to have a lovely collection of fascinating specimens. You may click on the images to visit their website for more information on these antique jewels.

Edwardian earrings set with blue moonstone and old mine cut diamonds:



Edwardian pendant set with old mine and old European cut diamonds and a pearl:



A very unusual piece - portrait diamond surrounded by old mine cut diamonds and emeralds:



Next time we meet: Old European Cut

7 comments:

BeadSire said...

Another wonderful post - this has been a fascinating series

MmeMagpie said...

Glad you like it. I've been made to look at countless wonderful things in the making of this series :)

mcstoneworks said...

What wonderful sparkles and information.

Cat said...

I'm drooling heavily here ... and the information is a definite plus!

galadryl said...

What a beautiful cut, love the look of the second ring. Thank you for all the info.

ShinyAdornments said...

Fascinating indeed. Great post. I love your take on all things technical.

:-)

Kristy
shinyadornments.artfire.com

Jeanne said...

Wow, I am loving diamonds more and more... blue diamonds especially catches my eye. Thank you for this history and explanations!