1. GJSPC LABORATORY GJSPC LABORATORY

2. About Us  GJSPC LABORATORY reports represent the highest standard of reliability, consistency and integrity.  And now, GJSPC LABORATORY “Report Check” is available for all GJSPC LABORATORY reports, providing you with an additional level of assurance. With “Report Check”, you can quickly and conveniently confirm that the information on your report matches what is archived in the GJSPC LABORATORY report Database.  GJSPC LABORATORY Report Check is intended to help confirm that the report number provided by the user of this service corresponds to an existing data record archived in the GJSPC LABORATORY database.  GJSPC LABORATORY reports represent the highest standard of reliability, consistency and integrity.  And now, GJSPC LABORATORY “Report Check” is available for all GJSPC LABORATORY reports, providing you with an additional level of assurance. With “Report Check”, you can quickly and conveniently confirm that the information on your report matches what is archived in the GJSPC LABORATORY report Database.  GJSPC LABORATORY Report Check is intended to help confirm that the report number provided by the user of this service corresponds to an existing data record archived in the GJSPC LABORATORY database.

3. Natural Diamond v/s Synthetic Diamond Natural Diamond v/s Synthetic Diamond The distinction starts with a basic fact: Diamonds are diamonds and all other materials are not diamonds. Diamond is one of the three natural forms (amorphous carbon, graphite, diamond) of the element carbon and has the following physical properties: Hardness of 10 as measured on the Mohs hardness scale  Density averages 3.51  Cleavage in 4 directions  Refractive index is 2.4 The distinction starts with a basic fact: Diamonds are diamonds and all other materials are not diamonds. Diamond is one of the three natural forms (amorphous carbon, graphite, diamond) of the element carbon and has the following physical properties: Hardness of 10 as measured on the Mohs hardness scale  Density averages 3.51  Cleavage in 4 directions  Refractive index is 2.4

4.  Dispersion is 0.044  Luster index is 17.2% There are two types of diamonds: natural diamonds and synthetic diamonds. Natural diamonds are mined from the earth and formed by nature. Synthetic diamonds are man-made in a laboratory using high pressure and high temperature.  Refractive index is 2.4  Dispersion is 0.044  Luster index is 17.2% There are two types of diamonds: natural diamonds and synthetic diamonds. Natural diamonds are mined from the earth and formed by nature. Synthetic diamonds are man-made in a laboratory using high pressure and high temperature.

5. Need of Testing Diamond The primary way of testing a diamond is by using a testing machine. These small mechanisms send heat through the gem to test how quickly it conducts the heat. Every type of stone has it's own rate of conducting heat, meaning that a real diamond will always go at a certain speed. The only problem with this method is that another mineral, moissanite, has the exact same rate of heat conductivity as a diamond, so special tests need to be done after the fact to ensure that the diamond is not this mineral.

6. But those who do not have access to a diamond testing machine have other means of finding out. Diamonds distort whatever goes through them, whereas a fake stone will show a clear image like glass. Placing a diamond on top of some newspaper text, for example, is a way to test this. If the stone distorts the letters, it is real. If the stone acts like glass and is completely see- through, it is fake.

7. Testing Methods For unmounted diamonds : 1. Look at the stone's refractivity.  The newspaper method  The dot test 2. Observe the reflections. 3. Drop the stone in a glass of water and see if it sinks to the bottom. 4. Heat up the stone and see if it shatters. For unmounted diamonds : 1. Look at the stone's refractivity.  The newspaper method  The dot test 2. Observe the reflections. 3. Drop the stone in a glass of water and see if it sinks to the bottom. 4. Heat up the stone and see if it shatters.

8. Testing Professionally: 1. Ask for a heat probe test. 2. Request combination diamond/moissanite testing. 3. Get a microscopic examination. 4. Subject the diamond to high sensitivity weighing. 5. Inspect the diamond under ultraviolet (UV) light. 6. Get an x-ray examination. Testing Professionally: 1. Ask for a heat probe test. 2. Request combination diamond/moissanite testing. 3. Get a microscopic examination. 4. Subject the diamond to high sensitivity weighing. 5. Inspect the diamond under ultraviolet (UV) light. 6. Get an x-ray examination.

9. Identification Report Identification Report is a response to the increase in treated and synthetic diamonds in the market place. Available for D-Z and colored diamonds 0.20 carats and less and black diamond’s 5.00 carats and less, Diamond testing services offer tests to determine: Natural vs. synthetic and color treatment Clarity treatment Diamond type Gem material Surface treatment

10. Diamond Grading Report The GJSPC Laboratory Diamond Grading Report includes an assessment of the 4Cs – Color, Clarity, Cut, and Carat Weight – along with a plotted diagram of its clarity characteristics. For standard round brilliant cut diamonds falling in the D-to-Z color range, the report also includes a GIA Cut grade.

11. Contact Us Address : K-95, West Patel Nagar, New Delhi-110008 Phone No : +91 9871253335, +91 9891097276 Office :+91-11-25885577,+91-11- 47980095 Email Address: gjspc.in@gmail.com Website : http://www.gjspc.in/contact-us Address : K-95, West Patel Nagar, New Delhi-110008 Phone No : +91 9871253335, +91 9891097276 Office :+91-11-25885577,+91-11- 47980095 Email Address: gjspc.in@gmail.com Website : http://www.gjspc.in/contact-us