hi I'm Steve Moriarty from Moriarty's gem art we're jeweler on the square in
Crown Point and we also represent ourselves as moregems.com which has a
wide variety of color gems and jewelry and also tanzanite jewelry designs calm
which is dedicated strictly to tanzanite gems and jewelry so today I'd like to
discuss with you a system you're going to see on our websites that is a grading
system for colored stones over the forty five years have been in the business
it's been a struggle to find a system that I was confident in that I
understood and and the customer could also understand but through discussions
with an investor Mike Dunn who's in Florida he's an engineer and has been
investing in tanzanite and our discussions have what has led me to this
gradient system the system is a little more complex than what I'm used to doing
that breaks down colored stones a little more accurately and I think you'll find
that it's more understandable and and once you see the system you're gonna
find that it will give you a very good idea of the quality of the stone that
you're going to receive so this is the breakdown of our gradient system the gem
is tanzanite this one here it's an oval weighs eight point seven five carats
okay and under color we've done something a little different we're now
grading in daylight and incandescent light and the reason for this is many
colored gems appear differently in different types of lights color change
stones like Alexandra it can be read in one light in green and another
tanzanites like this can be much more violent in
incandescent and more blue in daylight so we're actually breaking down the two
different types of lighting and giving them a number so this whole system is
based on one to one thousand with one thousand being the best and in this case
this stone in daylight greater than 950 an
incandescent greater than 900 so if you add those divided by two we get an
overall color grading of 925 the clarity we've chosen to use the GI a system of
color grading that's probably the most understood of any system people that buy
diamonds are used to this system using flawless the VVS and in this case it
would be a ten or a thousand is what that translates to vs being a nine and
si1 being an eight SI to b and a seven and i1 being a five so GI a has
implemented this system and for colored stones they have a slight variation and
that's a gem type so there's three gem types one two and three ones are
typically clean stones twos are often seen clean but that there are more often
have some imperfection in type three has almost always has imperfection like
emeralds and and rubellite tourmaline z' so what this does in a type-1 system we
just go straight from from the grading type to would allow you a little bit of
leeway in this so an i1 might be an SI two and type three can be one or two
jumps in the clarity it's just a way of giving some latitude to stones that
typically do not come clean and it helps us in getting a better idea of what what
that kind of grading is and how to price those types of stones
the third is is the cut grade we've broken it down into four different
categories the brilliance of the stone where I'll take this around to different
lights and just look at what the overall brilliance of the stone is and give it a
number from one to a thousand in this case it's an eight seventy five the
symmetry I will look at the stone from four different directions face down
face up or looking at the table looking down the end of the stone and looking to
the side and then giving it again one to a thousand number in this case 825 the
faceting is just how well the facets are placed
well the facets meet and again give it a number from one to a thousand and this
is an 850 the polish is how clean each facet is are there scratches are there
little divots that are a sign of under polishing the stone are there chips and
in the in the polish or scratches in the table and these will end up giving us
this number of 825 so now we take those four qualities add them up divide by 4
and that gives us this number of 844 for the cut grade now we add the color the
clarity and the cut grade and get a number divided by 3 and that's what
gives us this final grade of 923 which we call our overall cut grade so you'll
start seeing this on our site it'll just give you a number of 900 out of a
thousand and what this kind of means is stones from say 700 to 825 would be
stones we consider of good quality the stones from 825 to 900 would be very
good quality and the stones from 900 above are those of exceptional quality
so again hopefully with this system of grading the pictures that we have
available and the videos of the stones which we feel are quite accurate you can
get a very good idea of what the stone quality is and what that stones going to
look like when you receive it so thanks for watching and I'm Steve Moriarty from
Moriarty's gem art and tanzanite jewelry designs