Concave Diamonds #557, Northwood
The pattern is a soft quilting or diamond effect, always with a stretch-type iridescence. Complete water sets, like the celeste blue example at left, will include coasters for the tumblers and a lid for the pitcher. Found mostly in celeste with occasional vaseline and rare russett/olive pieces showing up.

Hartung Book Five: Concave Diamonds
Hartung Book Nine: Concave Diamonds Open Sugar

Water set, 14-16 pieces (with coasters lid)

Celeste blue, 350 (2016), 140 (2017),
   300, 475 (both 2019), 225, 400 (both 2020)

Celeste blue, with original Jewel T box, 550 (2008)

Water set, 10 pieces (4 tumblers, coasters, lid)

Celeste blue, 375 (2013)

Water set, 7 pieces (no lid, 6 coasters)

Celeste blue, 225 (2019)

Water sets, 7 pieces (with lid, no coasters)

Celeste blue, 300 (2016), 226 (2018)

Water sets, 7 pieces (no coasters or lid)

Celeste blue, 100-200

Vaseline, 1,300 (2000), 800 (2006),
   700 (2007)

Water set, 8 pieces (6 tumblers, lid)

Celeste blue, 160 (2014), 150 (2016),
   110 (2017)

Water pitchers

Celeste blue, with lid, 300 (2018), 90 (2021)

Celeste blue, 2 tumblers, lid, 70 (2017)

Vaseline, 800 (2008)

Water Tumblers

Celeste blue, 10, 15 (both 2017), 10 (2018),
   2.50, 15 (both 2019), 10, 15 (both 2021)

Ice blue, 2 sold for $30 each (2022)

Olive/russet, 450 (2002), 450 (2012),
   400 (2019)

Topaz, 55 (2020)

Vaseline, 40, 50, 65 (all 2017),
   30, 50, 65 (all 2019), 75, 80 (both 2020),
   30 (2021), 80 (2022)

Tumbler and coster

Celeste blue, 5 tumblers, 4 coasters, 50 (2019)

Vaseline, 60 (2013)

Tumble up (water jar and small tumbler that stores inside neck), sometimes called a guest set

Blue, 175 (2009)

Celeste blue, 200 (1997), 525 (2000)

Olive/russet, 155 (2004), 100 (2009),
   250 (2019)

Vaseline, 1,050 (2016), 375 (2017),
   325 (2019)

Tumble up tumblers only

Blue opaque, 80 (1998)

Celeste, 20 (2011), 35 (2015), 55 (2019)

Olive/russet, 13 (2011), 50 (2012), 15 (2019)

Sapphire blue, 20, 35 (both 2011)

Vaseline, 50 (2012), 65 (2017), 35 (2019)

The 6-inch ruffled vases were whimsied from the tumble up bottle minus the handle.

Vases, about 6 inches tall

Celeste blue, 75 (2014), 60 (2015), 60 (2017)

Citrine, 65 (2005)

Ice blue, 45 (2007)

Russet/olive, 85 (2004), 130 (2007), 60 (2015)

Vaseline, 450 (2003), 85 (2016), 550 (2017)

Updated 4/11/2022

It's not known if this pickle castor was made by Northwood or is from the same line, but, in marigold, it sold as Concave Diamonds at a 2009 auction for $545. Another brought $375 in 2012.