diamond with 4C?
Carat - less than 1 carat 
Colour - near colourless (according to the cert) 
Clarity - no idea
Cut - Premium
My own C is Cost - Just because I feel that Diamonds are a waste of good money. 
bro,
let me teach you how to look on diamond
i have get some info and study on diamond during want to get a diamond for my current wife.
diamond yes measure in 4 C, Carat, color , clarity, Cut
and this 4 C will determine the price,
many jewery shop selling diamond and some is in ex price but some is lying, you must know how to see to enable you to get a real quality diamond.
normally we as a buyer what we can see with our eye is carat, color and CUT(neet experience)
1) carat - everyone know big or small diamond the bigger the expensive.
2) color - the colorless is the expensive
3) Cut - premium cut, excelent cut, triple excelent cut. each diff cut give different shining,
for sure for premium cut with the normal sportlight u see shine, but normal light u see nothing just a glass, but for triple excelent u see shine all the time, u can proof when u got a primium and 1 excelent put both together u see.
4) Clarity - this is the hardest part and most of the ppl is no idea what is it. and this is where the cheat your money.
this is the clearness of the diamond, and it only can be seen by expert with a 10-20x len zoom, and some as you can see in the cert but the cert some is fake they can make a cert in any lab. as expert told me, the real cert is only for 1 karat above that is how they lazer the code at the diamond, below the 1 karat there is no way can lazer the code to the diamond, so how can u so sure the cert is belong to that diamond.
clarity is consist of vvs1, vvs2, vs1,vs2, s1,s2, l1,l2
the vvs1 is the best (very very slily dirt) almost clear. that is the expensive,.
the are 1 expert told me, he saw some ppl bough a 1 karat diamond with cert everything about 10K above when she want to trade in the diamond, actually it is not a good clarity, color, and cut make the diamond not even worth back 10K, that aunty cry until crazy, always know how to buy diamond.
and there is a fake diamond as well (they call human made diamond) when ever buy a diamond, they have a device to test on the stone is it a real diamond or not, something like autrasound, something like that.
i see and use before when i bough the stone for my wife, it really give a big sound when it hit a diamond when the devices, but you get a bit no sound lighting to a stone when you hit a stone, middle light for gold and silver, diamond sound when u hit real diamond.
