Gold Karat and its weight

A friend of mine emailed me asking for the purity of 10k rose gold. This is the informaion I have given to him.
Gold Karat: (in UK it spells carat)
1k    .0417
2k    .0833
3k    .1250
4k    .1667
5k    .2083
6k    .2500
7k    .2910
8k    .3333
9k    .3750
10k  .4167
11k  .4583
12k  .5000
13k  .5417
14k  .5833
15k  .6250
16k  .6667
17k  .7083
18k  .7500
19k  .7910
20k  .8333
21k  .8750
22k  .9167
23k  .9583
24k  1.000
Letters in red mean most commonly produced in jewelry.
Fine (pure) gold is too soft for jewelry, thus we have to mix with alloy to achieve a desired hardness. Silver and copper are the two common components, but many others can be used.

Thus, The proportion amount of 10k gold is .4167% pure gold and .5833% for alloy
By law, a metal described as 10k must be at least .4167 gold. The remainder of the alloy is not really stricted by law.

In jewelry market, we have 3 colors of gold jewelry, yellow, white and pink (rose gold).
By using specific alloy the metal can change to the desired color. Just check with your local alloy suppliers

Gold Karat weighs differently, the chart below will give you some ideas

After sending the above, I expected my friend would give me a big thank, but he just said the information was too long and irrelevant!!

Diamond

While selling my Diamond Jewelry, I was oftenly asked by customers to comment on the value of Diamond Jewelry they were wearing. This is a very difficult question for me as I may quote the price too high or too low. Most of the time, I quoted it very low which gave them eye and mouth open. I based my price on wholesale manufacturing cost plus profit.

The easier question for me is to explain to them how to check a good diamond criteria. The basic knowledge of diamond to look is 4C's. That is Cut, Clarity, Color and Carat.
Cut: means its facets.Standard cut will have table, crown, birdle, pavillion as shown

Clarity: by its nature almost all diamonds have blemishes called "inclusion"

The terms we use are IF (Internally Flawless), VVS 1, VVS 2 (Very, Very Slight Inclusions), VS 1, VS 2 (Very Slight Inclusions) SI 1, SI 2 (Slight Inclusions) I 1, I 2 (Inclusions)

Color: In Gemology, we rate the color of diamond from "D" (colorless) to "Z" (Saturated)

Carat: refers as the weight of diamond. One Carat is equivalent to .2 grams

Table below is useful information to check the weight vs width of your diamond

Jewelry Wax Carving

Wax carving is the first step in creating jewelry piece. Yet it is the most important step in the jewelry industry. Good wax carving gives good mold and good final finished jewelry piece.

Most of the wax carver here are taught by their senior jewellers. Howerver, there's an institute in Silom area that offers a course for 3months' period and charged the fee about Bht. 15,000 guaranteed for workmanship or the boss's satisfaction.

For Thai people, I think our craftmanship is second to none as we love to carve things since the old time. We did fruits carving in the palace. We join the world's ice carving competition though we never have a snow in the country and amazing candle carves for Makabuchaday

(Buddhist Lent Day)

When you ask these people to carve things for you, please

please give them fullest details eg good picture/sketch, dimension of width,length, weight etc.

From my observation, the size of wax will be about 3-4% bigger than the finish produce as it will shrink during the loss wax process. For example, if you need ring size 10, you have to carve the wax for size 10 and a half.