The Carat, Metric (ct) in Weight

What is Carat, Metric (ct)

A carat, metric (ct) is a unit of weight used for gemstones and pearls. It is defined as 200 milligrams (mg) or 0.2 grams (g). The term "carat" originated from the seeds of the carob tree, which were historically used as a balance scale to weigh gemstones. The carat is not only a measure of weight but also plays a significant role in determining the value of gems. A higher carat weight generally indicates a larger and more valuable gemstone, assuming other quality factors (like clarity, color, and cut) are constant.

Common Conversion Values

Since the carat is a metric unit, it can be converted into various other weight measurements. Below are some common conversion values for the carat:

• 1 (ct) = 0.0000002 (t)
• 1 (ct) = 0.000002 (q)
• 1 (ct) = 0.0002 (kg)
• 1 (ct) = 0.2 (g)
• 1 (ct) = 200 (mg)
• 1 (ct) = 200000 (µg)
• 1 (ct) = 200000000 (ng)
• 1 (ct) = 0.0000001968413 (ton)
• 1 (ct) = 0.0000002204623 (sh tn)
• 1 (ct) = 0.000003936826 (cwt (UK))
• 1 (ct) = 0.000004409245 (cwt (US))
• 1 (ct) = 0.000004409245 (sh cwt)
• 1 (ct) = 0.0000157473 (qrt)
• 1 (ct) = 0.00003149461 (st)
• 1 (ct) = 0.0004409245 (lb av)
• 1 (ct) = 0.0005358458 (lb t)
• 1 (ct) = 0.007054792 (oz av)
• 1 (ct) = 0.006430149 (oz t)
• 1 (ct) = 0.1128767 (dr av)
• 1 (ct) = 0.05144119 (dr t)
• 1 (ct) = 0.128603 (pwt)
• 1 (ct) = 0.9746753 (kt)
• 1 (ct) = 3.086472 (gr)
• 1 (ct) = 0.00001220964 (pd)

Knowing these conversion values can be particularly useful for gemologists, jewelers, and consumers when evaluating gemstones and performing weight-related calculations. The carat's importance in the jewelry industry highlights the need to understand its measurement and conversion to ensure fair trade and appraisals.