Carat

• 6.5mm 1.00ct
• 5.8mm 0.70ct
• 5.1mm 0.50ct
• 4.8mm 0.40ct
• 4.3mm 0.30ct
• 3.8mm 0.20ct
• 3.0mm 0.10ct

Although often thought of as a unit of size,carats are a unit of weight for gemstones,
with one carat weighing 0.2 grams.
It is said to derive from the Greek word "Kararation," which means locust bean,
since in ancient times locust beans (carob beans) were used as weights to weigh gemstones.