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How do you evaluate the cut of the Lucida diamond? + where else can you get it?

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Romeo

Rough_Rock
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Oct 22, 2001
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Can we get Lucida cut Diamonds from other vendors other than Tiffany's (by another name)? What is the name of the cut. How do you evaluate the cut of the Lucida diamond (angles, etc.)?
 

Garry H (Cut Nut)

Super_Ideal_Rock
Trade
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Aug 15, 2000
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14,919
More about spread for round diamonds.
Spread or apparent size of a diamond is the most important factor to many diamond buying consumers. Spread has been ignored in previous cut grading systems, but HCA compares and rates it. A diamond that looks bigger than another is not necessarily more beautiful, but it is more desirable. A diamond of the same weight but larger diameter is said to ‘spread’ more. Spread is a matter of desirability rather than a beauty factor. Size equals ‘desirability’.First time consumers often mistakenly consider the spread of a diamond to be directly related to its weight. Even within the trade, the depth percentage is used as a value factor in determining spread, but depth percentage is a poor metric because girdles and crowns have more impact on weight a diamond’s pavilion. For many consumers everything about the beauty of a diamond is salesmanship, because after all even ugly diamonds are beautiful; to some size is all that counts, and having advice about the size rather than the weight is critical.

So given the importance of spread, why has it been completely ignored?These 2 diamonds both measure 5.2mm in diameter, but the 0.65ct lifeless one is 20% deeper than the 0.50ct ideal cut.The HCA system calculates a spread penalty for a diamond based on the three main geometric components: crown, girdle and pavilion. We choose to give a zero penalty for a diamond with a 40° pavilion, 32.5° crown, 58% table and a 1% girdle, diamonds with better spreads also rate zero. The worst score of 2.0 is given to a diamond with a 10% girdle, 40° crown, 54% table and 43° pavilion. Stones with even worse spreads are not further penalized.Romeo you can compare the spread of a princess cut to a round diamond by this arithetic -
Spread of princess cut = LXW
Spread of round diamond = 1/2 diameter x 1/2 diameter x 3.142
Expect lucida / radiant / princess will have much smaller spread.
 

oldminer

Ideal_Rock
Trade
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Sep 3, 2000
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6,360
There are similar cut diamonds. I know one is called a Lucere rather than Lucida. There is another one also other than the Lucere, it begins with an "L" also, but I can't think of the name.As far as I know, only TIffany & Co. Sells the Lucida.One must judge the quality of the cut by comparison with other diamonds. this is not easily done by the consumer and there is no easy method for me to suggest. You really need expert asistance when it comes to that sort of judgement.------------------
David Atlas
Accredited Gem Appraisers
 

Romeo

Rough_Rock
Joined
Oct 22, 2001
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As an engineer, I would say the string is 6.475 +/- .175 mm. What about the dimensions of an equivalent rating of "Fair" or "Good" for a Lucida cut?
 

Romeo

Rough_Rock
Joined
Oct 22, 2001
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13
What exactly is a spread? I looked at the description on the tutorial page and it didn't help very much.Thanks
 

Romeo

Rough_Rock
Joined
Oct 22, 2001
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OK, so I think this is my last question - sorry for the newby questions...What is the radius of an ideal cut round 1 carat stone - and what is the length (or width) of an ideal cut 1 carat lucida (I guess it is kind of octagonal table, not square? - are the outer dimensions square)I think you can see where I am going here, what is the spread difference for a 1 carat lucida versus 1 carat round. In an earlier post I got the impression it is about 0.8 (Lucida) to 1 (Round) ratio.
 

mbn

Shiny_Rock
Joined
Sep 8, 2001
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212
it seem the lucida diamond fr. Tyf looks larger than a round, corners are tapered, and shines and shines.
 

Garry H (Cut Nut)

Super_Ideal_Rock
Trade
Joined
Aug 15, 2000
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14,919
Luida is a way of getting a 1ct diamond from rough that would yeild a .80ct ideal cut and charging a lot of money = profit for Tiffany who have registered the cut and trade name.
The spread is very very poor.
A fair comparison is with old cut diamonds. The science behing the cut is a retro step.
 

Romeo

Rough_Rock
Joined
Oct 22, 2001
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13
I saw the page but it didn't really say what the spread is. From what I understand now, basically it is a top surface area to carat ratio... sort of a cut's top view efficiency. It makes sense that different cuts have different spreads, and that different quality of cut will affect the spread (I guess that is what the page was trying to say - I just didn't get it the first time).
 

ThreeRabbits

Rough_Rock
Joined
May 3, 2002
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1
I think this is the company that makes Lucére diamond:
http://www.cutbygauge.com/lucere.html

Other people also mentioned the Flander cut is similar to the Lucida cut as well, since they are cut in a way as round diamond does. Check this site for pic:
http://www.flanders-brilliant.com/tables.htm

Or you can go to this site and search under "Square" diamond and you will find the flander called "The Dream:"
http://www.hearts-on-fire.com
 
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