I,m looking at two wholesale diamonds one is a round brilliant .61 e vvs2 with excellent symmetry and polish a faceted medium girdle no flourescence. The table is 58% and the depth is 60.3% Under characteristics it says needle what does that mean? The cost is around $2100.00 is it worth paying around $450.00 to get basically the same specs. but a d vvs1 should i pay to upgrade is it a better investment is there a major difference of look between the two I need a professional opinion.