Calibrated gemstones are precious or fine gemstones that are sorted by size and shape considered standard on the coloured gemstone market. 

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Alexandrite OV 6.5x5mm

Natural Alexandrite OV 6.5x5mm with colour change..

Apatite Lot 2mm

Apatite Lot +-2mm, 9pcs with different tones..

Apatite Lot 3mm

Apatite Lot +-3mm, 4pcs with different tones..

Australian black opal 5.3x4.4mm

Australian black opal 5.3x4.4mm with blue, red, green and yellow color play...