We manufacture some of the finest precious stones and are the global suppliers for emeralds, all types of sapphires and ruby's. Our skilled craftsmanship is expressed on each piece we make. For bulk prices on standard, calibrated and free sizes use our quick price request tool.

Our color-stones and diamonds are reasonably priced. We provide certificates for each diamond in our certified diamonds gallery/section. Prices are on request basis.
  • DIAMOND SEIVE & GUIDE
  • COLORSTONE SIZE & GUIDE
PCS/CTS SIEVE SIZES WEIGHT DIA (mm)
1/200 +000 -0 0.005 0.90 - 1.10mm
We at EuroGems s.r.l. follow this seive size. It also is indicative of the general weight of a particular diamond with respect to sieve size.
1/175 +0 -1 0.006 1.10 - 1.15mm
1/150 +1 -1.5 0.007 1.15 - 1.20mm
1/120 +1.5 -2 0.008 1.20 - 1.25mm
1/110 +2 -2.5 0.009 1.25 - 1.30mm
+2.3 - 3 0.010 1.30 - 1.35mm
+3 -3.5 0.011 1.35 - 1.40mm
1/80 +3.5 -4 0.012 1.40 - 1.45mm
+4 -4.5 0.013 1.45 - 1.50mm
1/70 +4.5 -5 0.014 1.50 - 1.55mm
1/60 +5 -5.5 0.016 1.55 - 1.60mm
1/50 +5.5 -6 0.018 1.60 - 1.70mm
+6 -6.5 0.021 1.70 - 1.80mm
1/40 +6.5 -7 0.025 1.80 - 1.90mm
1/30 +7 -7.5 0.029 1.90 - 2.00mm
+7.5 -8 0.035 2.00 - 2.10mm
1/25 +8 -8.5 0.039 2.10 - 2.20mm
+8.5 -9 0.044 2.20 - 2.30mm
1/20 +9 -9.5 0.052 2.30 - 2.40mm
+9.5 -10 0.058 2.40 - 2.50mm
1/15 +10 -10.5 0.069 2.50 - 2.60mm
+10.5 -11 0.074 2.60 - 2.70mm
1/12 +11 -11.5 0.078 2.70 - 2.80mm
+11.5 -12 0.086 2.80 - 2.90mm
1/10 +12 -12.5 0.095 2.90 - 3.00mm
+12.5 -13 0.108 3.00 - 3.10mm
1/8 +13 -13.5 0.116 3.10 - 3.20mm
+13.5 -14 0.125 3.20 - 3.30mm
1/7 +14 -14.5 0.135 3.30 - 3.40mm
+14.5 -15 0.146 3.40 - 3.50mm
1/6 +15 -15.5 0.159 3.50 - 3.60mm
+15.5 -16 0.175 3.60 - 3.70mm
SIZE DIA (mm) 4) 0.40 CTS 4.8mm
1) 0.20 CTS 3.8mm 5) 0.50 CTS 5.2mm
2) 0.25 CTS 4.1mm 6) 0.75 CTS 5.8mm
3) 0.30 CTS 4.5mm 7) 1.00 CTS 6.5mm
Note
Standard Shapes and sizes of color stones followed by EuroGems s.r.l. We also make fancy shapes and sizes in free sizes.
Rounds Ovals Square Hearts Octagon Trillion Marquise Pears
1.5mm 4x3mm 2mm 4mm 5x3mm 4mm 4x2mm 5x3mm
1.75mm 5x3mm 2.5mm 5mm 6x4mm 5mm 5x2.5mm 6x4mm
2mm 6x4mm 3mm 6mm 7x5mm 6mm 6x3mm 7x5mm
2.5mm 7x5mm 4mm 7mm 8x6mm 7mm 8x4mm 8x5mm
3mm 8x6mm 5mm 8mm 9x7mm 8mm 10x5mm 9x6mm
3.5mm 9x7mm 6mm 9mm 10x8mm 9mm 12x6mm 10x7mm
4mm 10x6mm 7mm 10mm 11x9mm 10mm   12x8mm
5mm 11x9mm 8mm   12x10mm 11mm   14x9mm
6mm 12x10mm 9mm   14x10mm     15x10mm
7mm 14x10mm 10mm   16x12mm      
8mm 16x12mm     18x13mm      
9mm 18x13mm     20x15mm      
10mm 20x15mm            
12mm              
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