For example, if during a test 100 women use a certain contraceptive method and during a period of 12 months, 2 unintended pregnancies occur, the Pearl index is 2. Some examples include condoms with 2-15, standard days 4-5, IUD intrauterine device 0.2-2, birth control pill 0.1-1 or sterilization with 0.1-0.4. However, on average, a pearl’s value ranges from $300 to $1500. Within a pearl type, when other value factors are equal, the higher the luster, the more valuable the pearl. However, on average, a pearl’s value ranges from $300 The value of a pearl can vary dramatically depending on many factors, such as pearl type, size, color, surface quality, and more. She holds numerous real estate designations and has been an instructor and broker since 1986. Pearls range greatly in size. Colors can range from snow-white, black, silver, cream, yellow and sparkling gold. Based in Seattle, Mindy Sitton-Halleck has written a financial advice column and travel articles since 1999. "Factors in human fertility and their statistical evaluation". Surface - Blemishes or irregularities confined to the pearl's surface, taking into account the size, number, nature, location, visibility, and type of surface characteristics. Estimate Property market value for investment. 4) Trussell J. Color - Pearl color is described as a combination of a pearls body color and overtone. Stone Sizes. 1) Pearl, Raymond (1933). If you find that you don’t mind having a less “special” variety, or you don’t mind a few unnoticeable blemishes, you may be able to receive a great deal on your pearls. The 7 Pearl Value Factors as Described by GIA Size - Pearl size is stated in millimeters and the value of larger pearls is typically greater than the value of smaller pearls. The pearl with less significant flaws is always more valuable. If you do this comparison on cultured pearls and fake pearls, the difference is incredibly perceptible. A strand of South Sea pearls can range from $1,000 to over $100,000. From top to bottom, these Japanese saltwater cultured pearls show excellent, very good, good, fair, and poor luster. Contraception; 88(5): 604–610. More information on pearl luster>>>, With pearls the cleaner the surface the more valuable it will be. 600 Wilshire Blvd, Suite 1280, Los Angeles, CA 90017, Free 2 Day Shipping & Free 60 Day Returns. When grading pearl value these days, consider multiple factors. If you find that you don’t mind having a less “special” variety, or you don’t mind a few unnoticeable blemishes, you may be able to receive a great deal on your pearls. The measurements are generally rounded to the nearest half or whole millimeter. This Pearl index calculator evaluates the effectiveness of a contraceptive method by taking into account the number of pregnancies occurred during the study period. Cultured pearls have an internal radiance, but imitation pearls only have an exterior shine. The quality of the luster is directly related to how even and smooth the layers of nacre are. Natural pearls are very dangerous for oyster divers to find and bring to the surface of the ocean. This website doesn't support the the Internet Explorer browser. Matching - The uniformity of appearance in strands and multi-pearl pieces. 5) Sheps MC. Real pearls can cost anywhere from $300 to thousands of dollars, depending on these things. It has been statistically established that effectiveness/ failure rate is the main factor taken into account when choosing a particular contraceptive method. You’ll find that your pearls are a great investment, no matter how much you spend on them. The amethyst value chart (available to registered users) will help you accurately estimate the price of the gemstone you own, based on different factors. Examine the pearl's surface. The 6 Cultured Pearl Quality Factors There are 6 main factors to keep in mind when determining a pearl's quality, value and ultimately the price of the pearls: Nacre, Luster, Surface, Shape, Color and Size. Most real pearls we see today are cultured pearls. There are three variables taken into account in the Pearl Index Calculator as follows: ■ Number of pregnancies – self explanatory; ■ Number of months – meaning the time duration of the study in months or cycles of exposure by women in the study. See the gem listings for freshwater pearls and saltwater pearls for information on pearl-producing mollusk species and natural and cultivation sources. Shorter strands of pearls cost less than longer strands - even if they are the same quality. Scrutinize and establish the pearl’s luster. Akoya pearls are the classic round, white pearls. A wild pearl will be worth more than a cultured pearl. Most familiar-size pearls are 10 to 15 mm. However, on average, a pearl’s value ranges from $300 to $1500. The value of a pearl can vary dramatically depending on many factors, such as its type, size, color, surface quality, and more. Flawless pearls are very rare and go at a high price. Examine the pearl's clarity, searching for blemishes, imperfections, spots and other irregularities. Good quality Akoya pearls should have a nacre thickness of about 10-15% of the diameter of the pearl - in comparison Tahitian pearls may be up to 50% nacre. The Pearl Source provides pearls at many different price points. Additionally, her non-fiction articles appear in “Seattle Woman,” “Long Island Woman,” and other publications. More information on pearl color>>>, Pearls can range in size from 1mm seed pearls to huge 20mm South Sea pearls. They are also the largest pearl variety on the market. So, how much are pearls worth? Measure the pearl's size. A good quality pearl will have a few blemishes or marks - of course a pearl is from mother nature and few minor blemishes should be expected on all but the finest strands. Tahitian pearls are exotic, with dark colors. Pearls also tend to hold their value fairly well. There are 6 main factors to keep in mind when determining a pearl's quality, value and ultimately the price of the pearls: Nacre, Luster, Surface, Shape, Color and Size. More information on pearl surface>>>, A perfectly round pearl is the most sought after and the most rare of cultured pearls. This is a health tool that employs the Pearl rate formula in order to help research in clinical trials in regard to the effectiveness of the tested birth control methods. At the same time, every study assumes a constant failure rate independent on personal conditions, such as the fact that the most fertile couples will get pregnant first as well as young women before older women. Copyright © 2020 Leaf Group Ltd., all rights reserved. When an irritant enters the oyster or, as in the case of cultured pearls is placed inside the oyster, it responds by coating the irritant with layers of nacre. The measurements are generally rounded to the nearest half or whole millimeter. Akoya pearls are the classic round, white pearls. Join our newsletter for subscriber only discounts. Larger pearls take longer to grow and are more difficult to produce in better qualities. Shows you the step-by-step solutions solving absolute value equations! Imitation pearls, also known as "faux," or "semi-cultured," are not produced in anything living. Obstet Gynecol; 76(3 Pt 2):558-67. They come from pearl farms. Place a cultured pearl and an imitation pearl side by side. Lancet 222 (5741): 607–611. This is based on the method of calculation instituted by Raymond Pearl in 1933. The Pearl Index is mainly used in the comparison of contraception methods related to the number of unintentional pregnancies to 100 women years. A wild pearl will be worth more than a cultured pearl. Stay in the know: Breaking news and exclusive pearl finds! While pearl jewelry is definitely expensive, it's possible to find genuine pearl pieces at almost any price point. It also generates a normal curve and shades in the area that represents the p-value