CaB2Si2O2 Hardness 7.0 - 7.5. Occurrence First discovered in Danbury Connecticut, and named after that location, danburite is also found in Myanmar (Burma), Japan, Malagasy Republic, Mexico and Connecticut (USA). Appearance Transparent, found in colorless, yellow and pink. Danburite has diamond-shaped cross-sections and wedge-like terminations in contrast to quartz's hexagonal prisms and pyramidal terminations. Enhancements Danburite is not known to be enhanced. Wearability is graded as Excellent, Very Good, Good, Poor, and Forget It! For more details see the article on "Hardness and Wearability." The International Gem Society's Price survey of Internet and standard outlets gives a range of from $20 to about $80 per carat, depending on color and size, but limits itself to small gems. ... Sinkankas and Miller in their Standard Catalog of Gem Values lists wholesale prices as between $100 - $200 per carat for larger stones.