MIXED GEMS FROM TANZANIA

These are well polished cabachone stones that have been cut in Tanzania by experienced cutters ready to be set in jewellery.There are Tanzanites (purple) and Spinel (pink)

Popular colours

Mohs scale 6.5 to 7

Grading VVS

Weight. 0.83 cts app

Size 5 x 5 x 2 mm to 3 x 3 x 2 mm app

Type 1 Gemstones

The following gemstones are typically inclusion free, even minor inclusions detract from their value.

Diamond, Amethyst, Beryls(Aquamarine,Morganite), Citrine, Smoky Quartz, topaz, Chrysoberyl, Kunzite, Tanzanite, green Tourmaline, and Blue Zircon

IF     Internally flawless under extreme magnification (Very rare)

F     Flawless

VVS   Minute inclusions under 10x; invisible to the unaided eye

VS     Minor inclusions under 10x; usually invisible to the unaided eye

SI1   Noticeable inclusions under 10x; usually visible to the unaided eye

SI2   Noticeable inclusions under 10x; usually quite visible to the unaided eye

I1     prominent- moderate affect on appearance or durability

I2     prominent - severe affect on appearance or durability

I3     prominent- severe affect on beauty, transparency or durability

Type 2 Gemstones

Gemstones that normally have small inclusions that do not detract from value.

Alexandrite, Andalusite, Iolite, Peridot, Rhodolite, Ruby, Sapphire, Spinel, Tourmaline, Garnet, Amethyst, Red Zircon, Tsavorite; Blue, Orange, Purple, Fluorite.Yellow and Parti-colored Tourmaline

F     Flawless

VVS   Minor inclusions under 10x; usually invisible to the unaided eye

VS     Noticeable inclusions under 10x; often invisible to the unaided eye

SI1   Obvious inclusions under 10x; visible to the unaided eye

SI2   Obvious inclusions under 10x; very apparent to the unaided eye

I1     prominent - moderate affect on appearance or durability

I2     prominent - severe affect on appearance or durability

I3     prominent - severe affect on beauty, transparency or durability