Calibrated gemstones are precious or fine gemstones
that are sorted by size and shape considered standard on the coloured gemstone
8mm RD Natural white Opal..
Natural Alexandrite OV 6.5x5mm with colour change..
Amethyst 6mm from Morocco..
Natural ametrine from Bolivia 8x6mm..
Apatite Lot +-2mm, 9pcs with different tones..
Apatite Lot +-3mm, 4pcs with different tones..
Aqua-Marine P/C 4mm nice blue colour..
Aqua-Marine P/C 4mm pale..
Australian black opal 5.3x4.4mm with blue, red, green and yellow color play...