What To Know About Your Diamonds

JUMBO GOLD & DIAMONDS buys your diamond jewellery. We are well connected to the international diamond trade and offer our customers higher prices because of our diamond recycling program. Your diamonds are graded and priced according to the exacting qualities of the 4Cs (colour, clarity, cut & carat). We Buy Diamonds in Singapore at a very competitive price.

We buy diamond stones or diamond jewelry items in Singapore from our customers and pay them the best price for their used jewelry products. After testing the cut, colour, clarity and carat, we offer the best market price for raw diamonds or diamond jewelry, according to the market price.

Here are a few things you need to know about your DIAMONDS:

GIA Anatomy of a Diamond

GIA Anatomy of a Diamond - Image describing the anatomy of a diamond, from star length, table size, crown height, crown angle, pavilion angle, pavilion depth, total depth, girdle thickness, lower girdle/half facet length, culet

Diamonds are priced according to the 4 Cs, which are

Colour. Clarity, Cut, Carat, COLOUR

The Colour of a diamond is the degree of whiteness. According to GIA’s diamond colour grading system, colour grades start with D and end at Z. Whiter diamonds typically have a greater value.

GIA Color Scale - Colorless, Near Colorless, Faint, Very Light, Light


Clarity refers to the degree of inclusions and blemishes of flaws, carbon, spots, crystals, scratches, feathers, etc. in a diamond. The clarity of diamonds is graded using a 10x loupe. In short, higher clarity grades represent the increasing difficulty to spots inclusions and blemishes using a 10x magnification glass.


Diamond Grade IF - Internally Flawless

Internally Flawless. Without internal flaws or inclusions.

Diamond VVS1 VVS2

Very Very Small Inclusions 1 & 2. It is difficult to see with an untrained eye using a 10x magnifying glass.

Diamond VS1-VS2

Very Slight Inclusions 1 & 2. Difficult to see using a 10x magnifying glass.

Diamond SI1 - SI2


Slight Inclusions 1 & 2. Inclusions more easily detected under 10x magnification.

Diamond I1, I2, I3

Inclusions 1, 2 & 3 are visible under 10x magnification and even to the naked eye.

GIA Clarity Scale - Flawless, Internally Flawless, VVS1, VVS2, VS1, VS2, SI1, SI2, I1, I2, I3


Number of facets, polish, culet size and other characteristics affect the brilliance, fire and scintillation of a diamond. Brilliance refers to the reflection of all white light from the surface and inside of a diamond. It refers to the brightness of a diamond in a lighted environment.

The number of facets affects the proportion of the diamond, which has an impact on its brightness. A diamond’s polish is the degree of smoothness of each facet. Polish affects the reflection of light upon each facet. If the culet is too large, light escapes from the diamond, making it less brilliant.

A diamond’s fire can be better observed in a darker environment. The flashes of colour observed are known as fire. Sparkles in the diamond are known as scintillation. Cut proportion affects the refraction and dispersion of a diamond’s fire and scintillation.

Cut is graded by GIA on a scale of poor to excellent.

GIA Cut Scale - Excellent, Very Good, Good, Fair, Poor


Carat weight is the unit of measurement for a diamond.
1.00ct = 100 pts
5.00 cts = 1 gm

Due to rarity, as the size of the diamond increases, the price per carat is higher

GIA Carat Weight - 0.50ct, 1.0ct, 2.0ct, 3.0ct, 5.0ct


Buying and selling diamonds depends very much on the integrity of the jeweller. JUMBO GOLD & DIAMONDS specialises in buying and selling diamonds from 0.5 cts and up. We buy and sell diamonds at reasonable prices. Our business is about turning satisfied customers into repeat customers.