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Pearl Weight & Pearl Lenght
Pearl Price factors
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Weight
When pearl wholesalers buy large lots of cultured pearls, they are often charged according to the weight of the pearls. The measure generally used is the momme, an ancient Japanese unit of weight which equals 3.75 grams or 18.75 carats. Kan is a Japanese unit of weight
When pearl wholesalers buy large lots of cultured pearls, they are often charged according to the weight of the pearls. The measure generally used is the momme, an ancient Japanese unit of weight which equals 3.75 grams or 18.75 carats. Kan is a Japanese unit of weight
equaling 1000 momme. Pearls are not sold by the momme or kan in retail stores.
The size of natural pearls is often expressed in pearl grains. One grain equals 0.25 carat. Natural American freshwater pearls may be sold according to their carat weight. The gram is commonly used to express the weight of cultured freshwater pearls, although carat weight is also used. One carat = 115 gram. Or in other words 5 carats = 1 gram.
Table 1 Weight Conversions
The size of natural pearls is often expressed in pearl grains. One grain equals 0.25 carat. Natural American freshwater pearls may be sold according to their carat weight. The gram is commonly used to express the weight of cultured freshwater pearls, although carat weight is also used. One carat = 115 gram. Or in other words 5 carats = 1 gram.
Table 1 Weight Conversions
| 1 carat (ct) | = 0.2 g = 0.007 oz av = 4 p grains = 0.053 m |
| 1 gram (g) | = 5 cts = 0.035 oz av = 20 p grains = 0.266 m |
| 1 ounce avoirdupois (oz av) | = 28.3495 g = 141.75 cts = 565 p grains = 7.56 m |
| 1 pearl grain (p grain) | = 0.05 g = 0.25 ct = 0.013 m = 0.0017 oz av |
| 1 momme (m) | = 3.75 g=18.75cts=75pgrains=0.131 oz av |
Table 2 (Based on data from the Shima Pearl Co.)
Size |
Pieces Per Momme |
Size |
Pieces Per Momme |
2.5mm |
160pcs |
6.5mm |
9.3pcs |
3mm |
90pcs |
7mm |
7pcs |
3.5mm |
63pcs |
7.5mm |
6pcs |
4mm |
40pcs |
8mm |
5pcs |
4.5mm |
27pcs |
8.5mm |
4.2pcs |
5mm |
19pcs |
9mm |
3.5pcs |
5.5mm |
15pcs |
9.5mm |
3pcs |
6mm |
12pcs |
10mm |
2.5pcs |
Lenght
When pricing pearls, you should take into consideration the length of the strand as well as the millimeter size of the pearls. The pearl trade has specific names for different necklace lengths. They are as follows:
| 1. Choker | A 14-16 inch (35-40 cm) necklace whose central pearl normally lies in the hollow of the throat or just below it. It looks especially attractive with V-neck blouses and dresses. |
| 2.Princess | A 16-20 inch (40-50 cm) necklace. This slightly longer length is well suited for pearl enhancers (detach able pendants) and can slenderize the neck. |
| 3. Matinee | A 20-26 inch (50-66 cm) necklace. Some people like to wear a matinee length along with a choker. Or they have it strung with two hidden (mystery) clasps so it can also be worn as a bracelet and a shorter necklace. |
| 4. Opera | A necklace about twice the size of a choker. |
5. Rope |
A necklace longer than an opera length. The defined length will vary according to the jeweler or company using the term. |
Pearl necklace lengths are summarized in the following list:
