The Moh’s hardness scale refers to scratch hardness. The resistance of one mineral to be scratched by another.
Friedrich Mohs (1773-1839), a Viennese mineralogist, introduced the term scratch hardness. The scale ranges from the softest at 1 through to the hardest at 10. Gemstones with a hardness of 1 and 2 are considered to be soft, from 3 to 5 medium, with 6 and over considered to be hard.
Because dust can contain quartz, it is important to realise that household dust can damage the lustre and brilliance of gemstones with a hardness below 7. Jewellery set with these stones should be well cared for to maintain their continued brilliance.
This table of Moh’s hardness lists gemstones by name alphabetically.
A B C – D E F G H – I J K L M N O P – Q R S T U V W X Y Z
A B C
|Axinite||6 ½ -7|
|Chalcedony||6 ½ -7|
|Chrysoprase||6 ½ -7|
Pages: 1 2 3 4
Some of the gemstone names we commonly use can be very confusing, and often costly to those unaware. For example, ‘Indian Jade’ is actually Aventurine, a form of quartz. The reference to ‘Jade’ is confusing and simply incorrect.
There are many such names that are still in use and you need to be careful when purchasing stones that use common names without referring to the true gemological name.
If you have purchased stones that were advertised using one of these names, the seller may have not know that the name is misleading. They also may have purchased it in good faith. However, often these names are used to confuse buyers and misrepresent stones.
Have a look at this list and you may find a few surprises.
Table of False & Confusing Names
|False Name||Gemological Name|
|Adelaide Ruby||Almandine Garnet|
|African Emerald||Green Fluorite|
|Alaska Diamond||Quartz Rock Crystal|
|American Jade||Green Idocrase|
|American Ruby||Pyrope Garnet, Almandine Garnet or Rose Quartz|
|Arizona Ruby||Pyrope Garnet|
|Arizona Spinel||Red or Green Garnet|
|Arkansas Diamond||Quartz Rock Crystal|
|Balas Ruby||Red Spinel|
|Blue Alexandrite||Colour Change Sapphire|
|Blue Moonstone||Chalcedony – artificially blue tinted|
|Bohemian Chrysolite||Moldavite – natural glass|
|Bohemian Diamond||Quartz Rock Crystal|
|Bohemian Ruby||Pyrope Garnet or Rose Quartz|
|Brazilian Aquamarine||Bluegreen Topaz|
|Brazilian Ruby||Red or Pink Topaz|
|Brazilian Sapphire||Blue Tourmaline|
|Californian Ruby||Hessonite – grossular garnet|
|Candy Spinel||Almandine Garnet|
|Ceylon Diamond||Colourless Zircon|
|Ceylon Opal||Opal-like Moonstone|
|German Diamond||Quartz Rock crystal|
|German Lapis||Chalcedony – artificially blue tinted|
|Gold topaz||Citrine Quartz|
|Indian Jade||Aventurine Quartz|
|King’s Topaz||Yellow Sapphire|
|Lithia Amethyst||Kunzite Spodumene|
|Lithia Emerald||Hiddenite Spodumene|
|Madeira Topaz||Citrine Quartz|
|Marmarosch Diamond||Quartz Rock crystal|
|Matura Diamond||Colourless Fired Zircon|
|Mexican Diamond||Quartz Rock Crystal|
|Mexican Jade||Marble – artificially tinted green|
|Montana Ruby||Red Garnet|
|Oriental Amethyst||Violet Sapphire|
|Oriental Hyacinth||Pink Sapphire|
|Oriental Topaz||Yellow Sapphire|
|Palmyra Topaz||Brown synthetic sapphire|
|Salmanca Topaz||Citrine Quartz|
|Saxon Chrysolite||Greenish-yellow Topaz|
|Saxon Diamond||Colourless Topaz|
|Serra Topaz||Citrine Quartz|
|Siamese Aquamarine||Blue Zircon|
|Siberian Chrysolite||Demantoid Garnet|
|Siberian Ruby||Red Tourmaline|
|Simili Diamond||Glass imitation|
|Smoky Topaz||Smokey Quartz|
|Spanish Topaz||Citrine Quartz|
|Strass Diamond||Glass imitation|
|Transvaal Jade||Green Grossular Garnet|
|Ural Sapphire||Blue Tourmaline|
|Viennese Turquoise||Artificially blue-tinted argillaceous earth|
Source: Gemstones of the World (5th edition), Walter Schumann
If you didn’t make it to the Cobb & Co Handmade Under the Stars artisan twilight markets, sadly, you missed out on a fantastic evening.
We were at the market last year and were very happy with the event on that occasion. There was a great turn out then, even though it rained, but this year has exceeded our expectations.
Continue reading Cobb & Co Handmade Market Update
Hey Everyone. We will be at the Handmade Under the Stars twilight market to the Cobb & Co museum here in Toowoomba. This is a fantastic market for handmade goods so please drop in and come say hello.
Continue reading Come visit us at The Cobb & Co Handmade Under the Stars Market
On Saturday 22 September we were at the CUA Community Hub for their market for the Toowoomba Carnival of Flowers. Such a great day. The staff at CUA went all out to decorate the Hub with a great theme for the carnival.
Continue reading CUA Market for Toowoomba Carnival of Flowers
Yes, I know. Why haven’t we posted anything much recently. It’s coming.
Been very busy trying to get our site and social media accounts working better.
Have spent time in developing the Supplies section of our store here. Listing cabochons and making it synch with our Etsy store. Many more supplies to come.
Continue reading A Quick Update
Just want to summarise for you what we have been doing over the last couple of months. Believe me, there has be a lot of that proverbial water go under our bridge. Some crystal clear and good, some not so much. But that’s life and we move on.
Continue reading We’ve been busy!
The methods and results in applying a patina to different metals are varied. I have only applied a patina to silver jewellery but by doing some research I have discovered information and results on other metals. As you will discover in this post. Continue reading Methods To Patina Your Metals
MOTHERS DAY SALE – 20% OFF EVERYTHING
Just want to let you know we will be at the CUA Showcase area in Ruthven Street next week from Tuesday 8, May through to Friday 11 May.
Continue reading We are at the CUA Showcase Room, Ruthven Street.
We make sure our glass products, Glass Art and Jewellery features, have all been carefully annealed to ensure strength and long life. However, you should care for Glass Art as it is still glass and misuse can result in damage.
Continue reading Care for Glass Art, for Long Life
One of my jewellery things to do is to do filigree work. So I decided to make a start by making a filigree pendant.
The pendant I decided to do was to make a round circle pendant filled with a filigree design and put a square red garnet set in a round sterling silver setting set on top of the filigree.
Continue reading First Time Filigree Pendant
My guess is that you’re wondering what the heck a Fertility Bowl is. Well, study the bowl for a few moments and I am sure you will understand why I called it that.
I didn’t intend to make a ‘fertility bowl’. It just seemed to evolve. Anyway, read on and I hope you enjoy.
Continue reading I called it a Fertility Bowl!