What is a trannie- a transitional Cut diamond?
OMC made an excellent post that clarifies:
To be called as "Old European Brilliant" (or "Old Mine Brilliant" if not round in shape), GIA wants at least 3 out of:
1. Table equal to or less than 53%
2. Culet equal to or larger than slightly large
3. Average crown angles of the centre bezels (across the width for cushions) are equal to or greater than 40°
4. Lower half length equal to or smaller than 60% (by visual inspection only)
Which rules out effectively all transitional cut brilliants and also many truly "old" ones, with the odd result that they end up being lumped with modern rounds and given a cut grade that in my opinion is totally irrelevant (a bit like judging an 18th century house on the basis of rational use of space and energetic efficiency on 21st century criteria).
snip... Tolk diamonds were invented in 1919 and diamonds in the 20s and 30s (from what I've seen) were gradually shifting in look to what we get now in the modern round brilliants.
I find it to be a cool period of time in the process of improvement in technology that lead to modern round brilliant diamonds. And of course other shapes.
If we look at this from a distance- it would seem that the basic design for Old Mine Brilliant and Old European Cut possess attributes that are valued today to the extent they are viable categories.
Transitional diamonds are far less of a "category"- even by GIA standards.
There's far fewer if for no other reason that technology and cutting prowess increased rapidly at that point. By the time WWII ended, when the diamond business came roaring back, in the '50's, the modern round brilliant was well established.
What this means is that the pool of true transitional stones- from the 20's and '30s was probably not all that great to begin with- and the ease of re-cutting stones like this means that most stones of import ( larger ones and higher quality) are now living as Modern Round Brilliants.
Here's a stone we took in trade recently
Here's the GIA report
One thing that stands out too me- in a positive sense- is that GIA gave this VG cut grade in spite of some easily visible aspects we might feel would offhand eliminate it.
For one thing, look at the measurements. The diamond is out of round to a loupe visible degree
Not that it hurts the stone in terms of overall brilliance and beauty.
What do you guys think?