Portuguese Cut Gemstones: Fancy Gem Cut Info - GemSelect
Portuguese cut gems feature faceting technique where the gem is cut with two rows of rhomboidal and three rows of triangular facets above and below the girdle (the girdle is the line that divides the top or crown of the stone from the bottom or pavilion).
Spinel Quality Factors - All About Gemstones - GIA
In fact, spinel is in great demand among gemologists and gem connoisseurs. This has, to some degree, closed the spinel vs. ruby-and-sapphire price gap. Blue spinel hues range from violet blue through very slightly greenish blue.
A much under appreciated gemstone, spinel has gained a lot of popularity recently. It's a beautiful gem, never treated or enhanced (yet), clean and sparkly, and hard enough for daily wear. This particular piece has a grape purple color, just under 3 carats, and is Burmese in origin.
American Cut fine Spinels from Gemfix in San Diego
Spinel. Spinel usually occurs in various shades of red, pink, orange, lavender, blue, purple, brown, grey and black. Some spinels are among the most famous gemstones: Among them is the Black Prince's Ruby and the 'Timur ruby' in the British Crown Jewels, and the 'cote de Bretagne' formerly from the French Crown jewels.
How to Cut a Portuguese Gem Design - International Gem Society
The classic Portuguese (Vargas) cut has 161 facets on it. Because of the depth that is needed to cut that many tiers and facets the stone/design is pretty deep. The depth of the original limits the material that will work well in it to …
Mahenge Spinel "Portuguese" Style Cut Oval Weight: 2.44cts Measurements: 9.7×7.3mm, depth 4.6mm Clarity: VVS-VS Origin: Mahenge, Tanzania Enhancements: None. Description: Yummy! Strawberry soda color with flashes of light red and hot pink. Well cut, eye clean at 8 inches or so.
Madeira Citrine at AJS Gems - Fine Precision Cut Gemstone ...
Madeira Citrine Citrine is the most popular gemstone in the yellow to orange color range, and one of the most affordable of the harder gem materials. A variety of crystalline quartz, citrine has excellent transparency and can be found in large sizes, with gems over 20 carats not uncommon.