Gems & Gold Weight and Pricing
Gems Weight Units
Carat – is the unit used to express the weight of gemstones, with one carat equal to 200mg of actual weight.
Gram – is a weight unit that is used for less expensive and rather small gems.
Grain – is used to weigh pearls. It is equal to 14 of the carat, i.e. 50mg. It is seldom used nowadays.
The centers of the jewelry’s business had their own mass measures.
So, the London carat was equal to 205,3mg, the Florentine one – 197,2mg. It explains the difference in the weight of historical diamonds. The metric carat was introduced in 1907 in Paris. It is equal to 200mg. That is what we have now.
How to Calculate the Price of a Gemstone
In the gems trade the price of 1 carat is indicated. If you want to calculate the full price of a stone you should not multiply the price of a carat by the stone weight in carats. The price of a carat rises progressively with the increase of the stone size. Say, if a diamond weighing less than 1 carat costs X, a diamond with the mass of 2 carats doesn’t cost 2X, but much more.
Gold
Yellow Gold – the gold’s natural color and is the most common gold used for jewelry
White Gold – It differs from yellow gold by addition of alloys. Usually they are palladium or nickel, zinc and cooper.
Rose gold – is made by alloying gold with cooper, which gives it a beautiful pink color.
24 karat = 100% gold
Too soft for jewelry
22 karat = 91.7% gold
Very soft — not recommended for jewelry
18 karat = 75.0% gold
Recommended for fine jewelry
14 karat = 58.3% gold
Recommended for jewelry
12 karat = 50.0% gold
Not acceptable for jewelry
10 karat = 41.7% gold
The legal karat limit considered as real gold in the United States
How to Calculate the Price of gold
The price of gold jewelry depends on the jewelry design, purity of gold or karat weight and amount of the material needed for this particular item.


What is it that women are buying and not buying today? The first thing they want is “Big” with a lot of bling. They are doing this by sometimes sacrificing the quality of stone for size, other times by choosing pieces with multiple diamonds that give the illusion of a big look. The days of women being satisfied with a plain gold wedding band are gone. Anything paved, basically small round diamonds set everywhere, with minimal metal showing is in hot demand.
then going for the traditional pricier precious
stones. Sales of the traditional sapphires, emeralds and ruby stone jewelry have plummeted and have been replaced by the colorful and “cheaper” alternative semi-precious stone jewelry. All colors sell and the popularity of a certain color will vary with the season and fashion. Beryls, rubellite, rhodolite, garnet, topaz, citrine, garnets, jade, tourmalines, periodot, amber, carnelian, jade, the selection and colors are endless. Pink and blue-green are always hot colors.
centerpiece pendants have been popular. After enduring a decade of the white metal and diamonds minimalism look, women revolted and the “bigness” of size and color became the flavor du-jour for women’s necklaces. During the minimalist period where necklaces were all worn short, the necklaces of today have evolved to the belly button length. These necklaces are usually 32″ or longer and worn long or doubled for a layered look.
Additionally, women want versatility in their jewelry. They want jewelry they can wear to the
office as well as go out to dinner and just plain live in. They want anything that gives her a feeling of change from day to night or that she can color coordinate with different outfits!!!!
The Tiffany Yellow Diamond, one of the largest yellow diamonds ever found has only been worn by two women. One wore it to dinner and the other for a publicity photo shoot. A diamond of this size and value is not very practical to wear as a matter of course. In the rough, before it was cut into 90 facets, it weighed 287 carats. Then it was cut down to 128 carats in a custom shape to maximize its brilliance. A diamond of this size and value cannot be cut in just any way. It must be carefully planned and executed or great waste will result. The young man that did cut the stone – only 23 years old at the time – studied it for a year first. The result was an outstanding and precious stone in every sense.
There are three types of black diamonds: natural, irradiation treated and heat-treated under high temperature. In the late 1990’s, one designer started using natural black diamond (carbonado), which had been used for industrial purpose till then, in combination with clear diamonds. This original idea was immediately copied by other designers and it became quite popular. To keep up with a growing demand for black diamond, it required securing sufficient material. As a necessity, artificial irradiation appeared on the scene. This takes otherwise uninteresting diamonds and makes them very dark green so they appear black. The third type of ‘black’ diamond is a new development. The stones were originally natural diamonds of very poor quality single crystals or white to grey polycrystalline crystals, which are turned black by being heated with very high temperatures.
Few people know that diamonds occur naturally in a variety of colors. Some are steel gray, while others are white, blue, yellow, orange, red, green, pink to purple, brown, and even black! Colored diamonds have impurities or structural defects that cause the coloration. Pure diamonds are perfectly transparent and colorless. Diamonds are split into two main types and some subtypes, according to the nature of impurities present and how these impurities affect light absorption.

