Last Updated: November 21st, 2016
FAQ's, Myths and Rumors
Gemcad Files of Famous Diamonds
Diamond Weight Estimation
Some Large and Unique Diamonds Seen on Ebay
Notable and Record-Setting Fancy Colored Diamonds Sold at Auction (see also the Wittelsbach Diamond)
Some Notable Jewelry Stores in Oregon
GIA has published an article in "Gems & Gemology" discussing the so-called Ruspoli Sapphire and its confusion with a separate, cushion-shaped sapphire.
Some of the upcoming stones are:
The Begum Blue
The Heart of the East
The Black Star of Queensland
The Empress Eugenie
The Paul I
The Golconda Pears
The English Dresden
Here are some stones that I am presently looking for photos and information on:
President Vargas ... largest gem cut from the stone weighs 44.17 carats
Brunswick Blue ... circa 13 carats, pear, dark blue (The diamond is a lost stone -- in this case a good illustration is what I am looking for)
Copenhagen Blue ... 45.85 carats, emerald, third(?) largest blue diamond in the world
unnamed ... 51.84 carats, round brilliant, blue, largest blue diamond in the world. (This and the Copenhagen Blue were both handled by Harry Winston at one time.)
Here's something new: I have made estimates for the measurements of two famous diamonds - the Blue Heart and the Porter Rhodes. I don't know their actual measurements, but I am researching it. I am going to post my estimate here and see how close I am (or not) to being correct.
The Porter Rhodes ... 21.65 × 21.65 × 13.09825 mm (assuming 60.5% depth, computes to 54.10 carats, actual weight is 54.04 carats)
The Blue Heart ... 20.035 × 20.035 × 12.121175 mm (assuming 60.5% depth, computes to 30.83 carats, actual weight is 30.82 carats)
The Porter Rhodes is an modern Asscher cut stone, which means its width and length are equal or very near to it. I doubt the stone is going to be indentical in length and width down to the hundredth of a millimeter, but it will be fairly close. The stone is very well cut.
This website was compiled by myself, Ryan Thompson, and is for educational purposes only! I don't make any money from this website, and never intend to. My goal is to try and archive images of all the world's most famous gemstones and diamonds, so people online can look and read about them freely.
^Since Andalé crashed and their website is a mess, I had to get a new hit counter. While editing the page on September 10th, 2006 I saw the hit counter had crashed. The number above is a guesstimate of how many hits I've had over the past few years.