Skip to main content
Go to accessibility notice

    Description

    COLOR CHANGE SPINEL

    Exceptional Gemstone: Color Change Blue Spinel - 14.33 Ct.
    Muhuwesi River, Tunduru District, Ruvuma Region, Tanzania

    The association between Sapphire (Al2O3) and Spinel (MgAl2O4) is sufficiently close that in many localities the two form together. To add to the confusion, both come in multiple colors and are only marginally different in hardness. As a result, it is not surprising to find that this cool blue gem, comes from a famous Sapphire locality: the Muhuwesi River in Tanzania. The same trace elements responsible for the gemstone's blue color are also responsible for a slight, but noticeable, color change between a violet-blue and a steely blue, depending on ambient lighting. It was found in 2003, probably in the dry season, when artisanal miners screen the gravels of the river when the annual flow is down. Later, it was faceted in an oval, mixed cut style in Bangkok, Thailand. The eye clean stone was examined by the AGL, resulting in a cert (#CS 65951) indicating that it has not been heated or otherwise enhanced.
    Measurements: 15.61 x 13.13 x 9.08 mm, 14.33 cts.
    Offered at no reserve.

    Provenance: Rainbow of Africa Collection
    Accompanied by AGL Certificate # CS 65951


    Condition Report*: Condition report available upon request.
    *Heritage Auctions strives to provide as much information as possible but encourages in-person inspection by bidders. Statements regarding the condition of objects are only for general guidance and should not be relied upon as complete statements of fact, and do not constitute a representation, warranty or assumption of liability by Heritage. Some condition issues may not be noted in the condition report but are apparent in the provided photos which are considered part of the condition report. Please note that we do not de-frame lots estimated at $1,000 or less and may not be able to provide additional details for lots valued under $500. All lots are sold "AS IS" under the Terms & Conditions of Auction.

    Shipping, Taxes, Terms and Bidding
    Calculate Standard Domestic Shipping

    Sales Tax information  |  Terms and Conditions

    Bidding Guidelines and Bid Increments

    Glossary of Terms

    Auction Info

    Auction Dates
    October, 2015
    15th Thursday
    Bids + Registered Phone Bidders: 4
    Lot Tracking Activity: N/A
    Page Views: 2,335

    Buyer's Premium per Lot:
    25% on the first $100,000 (minimum $14), plus 20% of any amount between $100,000 and $1,000,000, plus 12% of any amount over $1,000,000 per lot.

    Sold for: Sign-in or Join (free & quick)

    Heritage membership

    Join Now - It's Free

    VIEW BENEFITS
    1. Past Auction Values (prices, photos, full descriptions, etc.)
    2. Bid online
    3. Free Collector newsletter
    4. Want List with instant e-mail notifications
    5. Reduced auction commissions when you resell your
      winnings 
    Consign now
    • Cash Advances
    • More Bidders
    • Trusted Experts
    • Over 200,000 Satisfied Consignors Since 1976
    Only 30 days left to consign to the 2018 November 16 Ethnographic Art : American Indian, Pre-Columbian and Tribal Art Signature Auction - Dallas!

    Learn about consigning with us

    I sent out several inquiries, but Moyun is the primary reason I went with Heritage. She is extremely knowledgeable.
    Linda H.,
    Washington, D.C.
    View More Testimonials

    HA.com receives more traffic than any other auction house website. (Source: Similarweb.com)

    Video tutorial

    Getting the most out of search

    Recent auctions

    2014 November 21 Tiffany, Lalique & Art Glass Signature Auction
    2014 November 21 Tiffany, Lalique & Art Glass Signature Auction
    REALIZED $1,441,296
    2014 November 17 American Art Signature Auction
    2014 November 17 American Art Signature Auction
    REALIZED $6,712,638
    2014 November 14 American Indian Art , Pre-Columbian, & Tribal Art Signature Auction
    2014 Nov 14 American Indian Art, Pre-Columbian & Tribal Art Auction
    REALIZED $441,524
    2014 November 8 Modern & Contemporary Art Signature Auction
    2014 November 8 Modern & Contemporary Art Signature Auction
    REALIZED $5,683,719
    2014 November 6 Silver & Vertu Signature Auction
    2014 November 6 Silver & Vertu Signature Auction
    REALIZED $439,980
    2014 October 18 The Belo Collection of Texas Art Signature Auction
    2014 October 18 The Belo Collection of Texas Art Signature Auction
    REALIZED $624,835
    2014 October 16 Photographs Signature Auction
    2014 October 16 Photographs Signature Auction
    REALIZED $824,108
    2014 September 28 Nature & Science Signature Auction
    2014 September 28 Nature & Science Signature Auction
    REALIZED $1,089,341
    2014 Sept 13-14 Gentleman Collector Signature Estate Auction
    2014 Sept 13-14 Gentleman Collector Signature Estate Auction
    REALIZED $1,725,292
    2018 April 24 Illustration Art Signature Auction - Dallas
    2018 April 24 Illustration Art Signature Auction - Dallas
    REALIZED $1,407,487