Gemstone and Jewelry Industry earns hundreds of billion baht of income for Thailand from exports. Eighty percent of exported gemstones are cut and given valueadded in Chanthaburi. Chanthaburi has therefore been famous for gem cutting and burning from the past until today.


Chanthaburi is the biggest gems trade and production center in Thailand and Southeast Asia. This means that we are ahead in the competition and have the potential to make Thailand the gem center of the region and, finally, of the world in the future. In order to establish Chanthaburi as “City of Gems,” the Gem and Jewelry Center was built with the support of fund and land from Chanthaburi. It is and important gemstone trade and information center of Thailand.


The Chanthaburi Gem and Jewelry Center is and all-around gem center which comprises a gem museum, a multimedia room, gem exhibition hall, and gem cutting and inlay demonstration room.



Birth Stone


“January: Garnet – a lucky gem which gives you good health and longevity”




“February: Amethyst – keeps you calm, also a traveler’s charm”




“March: Aquamarine – gives you a peace of mind”




“April: Diamond or white zircon – makes you lucky in love, also gives you authority”




“May: Emerald or Jade – gives you wealth and peace”




“June: Pearl or Moon Stone – gives longevity, detoxifies and protects against evil”




“July: Ruby – helps you achieve love and make marriages last”




“August: Perridot or Carnelian – makes you brave and strong, gives you power and fame”




“September: Blue Sapphire – makes you loved and respected and get what you hope for”




“October: Opal or Rubellite – makes you happy, brings you lucy, and cures some diseases”




“November: Yellow Sapphire or Yellow Topaz – a good luck and friendship charm”




“December: Blue Zircon or Turquoise – gives you peace, prosperity and great power”



By the Day of the Week
Birthday Power Gems Wealth Gems
Sunday Ruby, Red Sapphire, Garnet,

Red Zircon

Emerald, Green Sapphire,

green gems

Monday  Yellow Sapphire, Amber, Citrine,

Golden Pearl, Yellow Diamond

Tuesday  Coral, Pink Pearl,

Rose Ouartz, Pink Sapphire

 Yellow Sapphire,

Green Sapphire (Lime color)

Wednesday  Jade, Green Tourmarine,

Green Garnet, Perridot, Emerald,

Green Sapphire, Amethyst

 Green Sapphire (Lime color),

Blue Sapphire

Thursday  Orange Garnet, Carnelian, Fire Opal,

Chrysoberyl, Orange Sapphire

 Red Sapphire,

Orange or White Sapphire

Friday  Blue Sapphire, Blue Topaz,

Lapis Lazuli, Turquoise, Blue Zircon

 Pink or dark green


Saturday  Sapphire, Diamond, Black Jade,

Amethyst, Purple Sapphire

 Blue Sapphire



The 4C’S

Clor: Choose gems with vivid color; the more vivid the color, the better the gem’s quality. However, be careful when the color is very dark as there may be flaws that are hidden inside. Generally, there are five grades of gems color.


Clarity: Consider the clarity and flaws of the gems. Good quality gems are clear without any flaws or cracks inside. The trick is to consider how flawed the gem is, if the flaws are visible to plain eye and whether they affect the beauty of the gem.


Cut: Consider the proportion and cutting quality as they affect the light transmission and sparkles of the gem called “sparks.” Beautifully cut gem are sparkly because the width of its facet and its depth are perfectly proportioned.


Carat: Carat is the measurement of gem’s weight. Naturally, gems that are bigger and weigh more are more valuable. Gems Considered valuable are 1 carat up. Bigger gems with good quality and weight would be much more expensive.

** 1 carat=100 points=0.20 grams or 200 milligrams.





A red variety of the Corundum family of minerals. Its specific gravity is about 4.0 and its hardness is at 9 which is less than diamond alone. Shades of ruby vary from pinkish red, purplish red, reddish orange to vivid red.



“Blue Sapphire”

Blue Sapphire

A member of the Corundum Family of minerals. It is blue with specific gravity of about 4.0 and hardness of 9, less than diamond alone. Blue sapphires can be varied such as purplish blue or bright light blue.



“Yellow Sapphire”

Yellow Sapphire

A Yellow corundum mineral with specific gravity of about 4.0 and hardness of 9, less than diamond alone. Varied shades of Yellow Sapphires are, for example, yellowish orange or golden yellow.



“Green Sapphire”

Green Sapphire

A green variety of the Corundum family of minerals. Its specific gravity is about 4.0 and its hardness is 9, less than diamond alone. Blue Sapphires come in a variety of shades such as bluish green, bright light green and yellowish green.



“Blue Zircon”

Blue Zircon

Naturally, zircon is brown and reddish orange. However, the popular color for zircon is blue which can be produced by heat treatment. Its specific gravity is 4.6 and its hardness is about 7.5.





A member of the Quartz mineral family which consists of 2 groups, microcrystalline and cryptocrystalline. Amethyst is microcrystalline quartz with specific gravity of 2.65 and hardness of 6.5-7.





A mineral which consists mainly of Carbon. Its specific gravity is 3.52 and its hardness is 10, the highest level of hardness. Diamonds can be in many colors such as yellow, pink, red and blue. Good quality diamonds mush not contain inclusions.





A mineral beryl. Emerald is translucent and clear with specific gravity of about 2.68-2.78 and hardness of 7.5-8.0 nice Emerald is green to vivid and dark green.





An organic gem made up of conchiolin and water. Its specific gravity is about 2.5 and its hardness is 2.5-4.5 Pearls can be categorized into saltwater pearls and freshwater pearls, and natural pearls and cultured pearls.





A member of the pyroxene group of minerals. Its specific gravity is about 3.4 and its hardness is 6.5-7. Jades vary in color such as green, purple, white, orange, red and black. The most popular color is green in different shades.





A mineraloid made up of silica and water. Its specific gravity is about 2.0 and its hardness is 5-6. An opal has rainbow-like colors. Opals can be opaque or translucent.



“Star Sapphire”

Star Sapphire

A Sapphire which contains special star-shaped inclusions. Colors are varied such as black, red, blue and golden yellow. Its specific gravity is 4.0 and its hardness is 9, less than diamond alone. Star sapphires with longer star legs are more favorable.